JEC COMPOSITES MAGAZINE - Issue #81 - May/June 2013 - 46

country guest of honour: Japan

Fracture behavior of glass mat
composite with open hole

By
Zhiyuan Zhang (1), Yuqiu Yang (2),
Hiroyuki Hamada (1)
1) Advanced Fibro Science, Kyoto Institute of
Technology, Kyoto, Japan
2) College of Textiles, Donghua University,
Shanghai, China

l

n using process, materials are
usually made holes to connect with
other parts in structure system as
forms of joints and fasteners. These
joints and fasteners can transfer loads
from one structural element to another. However, due to the hole effects,
joints and fasteners always became the
weakest area around holes and easy to
generate initial damage.
Therefore, the property of materials
with hole directly affects structural stability. In generally, 3 type of
loading configurations were usually
considered in study about circular
holes, including open-hole tension,
filled-hole tension and bolted joint
[1-3].
On the other hand, from bypassing
the weaving process, short fiber mat
can save the cost of production and it
has been widely used for many fibers,
such as, glass fiber, jute fiber and
kenaf fiber. Although it has been gained widely usage as reinforcements in
composite, the research on property

In this paper, the glass fiber chopped mat and unsaturated
polymer were used to fabricate composite with different plies,
including 3, 5 and 7 plies, and the mechanical property of
specimens with a 10 mm hole were investigated. The effect
of open hole of notched strength was discussed. From finite
element simulation in MSC-Marc software, the characteristic
distance was calculated and used to evaluate the sensitivity of
open hole. The relation between volume fraction and characteristic distance was also analyzed.

of this kind of reinforcements composite with open hole is found limited.
At current study, glass chopped fiber
mat and unsaturated polyester were
used to fabricate glass mat composite (gMC) plates in different plies
by hand lay-up method. gMC plates
were cut into specimens of different
dimensions, including 20, 30 and 50
mm width. 10 mm of diameter drill
were employed to make drilling hole
on the materials. The influence of
open-hole on mechanical property
was investigated from tensile test with
a cross head speed of 1mm/min.

Experiment
Materials
glass chopped mat with density of
450 g/m² and unsaturated polyester
resin (Showa: rIgOrAC 150HrbQ
NTNW) were used as reinforcement
and matrix. (Polymer was mixed
with the hardener MEKPO in a ratio
of 100:0.7.). 3, 5 and 7 plies glass
chopped mats were laminated by hand
lay-up molding method. The thickness of the composites was controlled by spacers to get different Volume

46 jec composites magazine / No81 May - June 2013

fraction of glass fiber. After curing the
resin in the room temperature for 24
hours, they were disposed at 100°C
(for 2 hours) as post-cure.
Specimen preparation
Firstly, the specimens with width
of 20 mm, 30 mm and 50 mm were
prepared and test in tension mode to
know the material constant. The cut
specimens were tapped with aluminum plate in both bottoms for tensile
test. Additionally, strain gage (KYOWA KFg-10-120-C1-11) was used for
the calculation of tensile modulus.
Furthermore, the notched strength
was also investigated by drilling the
hole on the center of specimens with
diameter I 0 mm.
In order to investigate the effect of the
drill hole on the mechanical property
on glass mat composite, several specimens with different width were also
prepared. At current study, the w/d
i.e. the ratio of width to the diameter
of the hole with the values of 2, 3 and
5 were used to discussed the effect the
hole among different width specimens.



JEC COMPOSITES MAGAZINE - Issue #81 - May/June 2013

Table of Contents for the Digital Edition of JEC COMPOSITES MAGAZINE - Issue #81 - May/June 2013

Cover
Edito
Point of view GKN Aerospace: Making wing without winging it
Contents
Agenda of Events
COMPANY & BUSINESS In Brief
APPLICATIONS
Truck
Corrosion
Wind
MARKET
Carbon
Recycling
Human ressources
SPECIAL JEC ASIA 2013
Participating companies
Conferences
Awards
Life achievement
Country guest of honour: Japan
Environment
RESEARCH & DEVELOPMENT
3D fabric
Cost prediction
TECHNOLOGY & INNOVATIONS
Automotive
NDT
Carbon
Adhesives
Index
In the world
JEC COMPOSITES MAGAZINE - Issue #81 - May/June 2013 - Cover
JEC COMPOSITES MAGAZINE - Issue #81 - May/June 2013 - 2
JEC COMPOSITES MAGAZINE - Issue #81 - May/June 2013 - Edito
JEC COMPOSITES MAGAZINE - Issue #81 - May/June 2013 - Point of view GKN Aerospace: Making wing without winging it
JEC COMPOSITES MAGAZINE - Issue #81 - May/June 2013 - 5
JEC COMPOSITES MAGAZINE - Issue #81 - May/June 2013 - Contents
JEC COMPOSITES MAGAZINE - Issue #81 - May/June 2013 - 7
JEC COMPOSITES MAGAZINE - Issue #81 - May/June 2013 - 8
JEC COMPOSITES MAGAZINE - Issue #81 - May/June 2013 - 9
JEC COMPOSITES MAGAZINE - Issue #81 - May/June 2013 - Agenda of Events
JEC COMPOSITES MAGAZINE - Issue #81 - May/June 2013 - 11
JEC COMPOSITES MAGAZINE - Issue #81 - May/June 2013 - COMPANY & BUSINESS In Brief
JEC COMPOSITES MAGAZINE - Issue #81 - May/June 2013 - 13
JEC COMPOSITES MAGAZINE - Issue #81 - May/June 2013 - 14
JEC COMPOSITES MAGAZINE - Issue #81 - May/June 2013 - 15
JEC COMPOSITES MAGAZINE - Issue #81 - May/June 2013 - Truck
JEC COMPOSITES MAGAZINE - Issue #81 - May/June 2013 - 17
JEC COMPOSITES MAGAZINE - Issue #81 - May/June 2013 - Corrosion
JEC COMPOSITES MAGAZINE - Issue #81 - May/June 2013 - Wind
JEC COMPOSITES MAGAZINE - Issue #81 - May/June 2013 - 20
JEC COMPOSITES MAGAZINE - Issue #81 - May/June 2013 - 21
JEC COMPOSITES MAGAZINE - Issue #81 - May/June 2013 - Carbon
JEC COMPOSITES MAGAZINE - Issue #81 - May/June 2013 - 23
JEC COMPOSITES MAGAZINE - Issue #81 - May/June 2013 - 24
JEC COMPOSITES MAGAZINE - Issue #81 - May/June 2013 - 25
JEC COMPOSITES MAGAZINE - Issue #81 - May/June 2013 - Recycling
JEC COMPOSITES MAGAZINE - Issue #81 - May/June 2013 - Human ressources
JEC COMPOSITES MAGAZINE - Issue #81 - May/June 2013 - 28
JEC COMPOSITES MAGAZINE - Issue #81 - May/June 2013 - 29
JEC COMPOSITES MAGAZINE - Issue #81 - May/June 2013 - Participating companies
JEC COMPOSITES MAGAZINE - Issue #81 - May/June 2013 - 31
JEC COMPOSITES MAGAZINE - Issue #81 - May/June 2013 - Conferences
JEC COMPOSITES MAGAZINE - Issue #81 - May/June 2013 - 33
JEC COMPOSITES MAGAZINE - Issue #81 - May/June 2013 - Awards
JEC COMPOSITES MAGAZINE - Issue #81 - May/June 2013 - 35
JEC COMPOSITES MAGAZINE - Issue #81 - May/June 2013 - 36
JEC COMPOSITES MAGAZINE - Issue #81 - May/June 2013 - 37
JEC COMPOSITES MAGAZINE - Issue #81 - May/June 2013 - 38
JEC COMPOSITES MAGAZINE - Issue #81 - May/June 2013 - Life achievement
JEC COMPOSITES MAGAZINE - Issue #81 - May/June 2013 - Country guest of honour: Japan
JEC COMPOSITES MAGAZINE - Issue #81 - May/June 2013 - 41
JEC COMPOSITES MAGAZINE - Issue #81 - May/June 2013 - 42
JEC COMPOSITES MAGAZINE - Issue #81 - May/June 2013 - 43
JEC COMPOSITES MAGAZINE - Issue #81 - May/June 2013 - 44
JEC COMPOSITES MAGAZINE - Issue #81 - May/June 2013 - 45
JEC COMPOSITES MAGAZINE - Issue #81 - May/June 2013 - 46
JEC COMPOSITES MAGAZINE - Issue #81 - May/June 2013 - 47
JEC COMPOSITES MAGAZINE - Issue #81 - May/June 2013 - 48
JEC COMPOSITES MAGAZINE - Issue #81 - May/June 2013 - 49
JEC COMPOSITES MAGAZINE - Issue #81 - May/June 2013 - 50
JEC COMPOSITES MAGAZINE - Issue #81 - May/June 2013 - 51
JEC COMPOSITES MAGAZINE - Issue #81 - May/June 2013 - Environment
JEC COMPOSITES MAGAZINE - Issue #81 - May/June 2013 - 53
JEC COMPOSITES MAGAZINE - Issue #81 - May/June 2013 - 3D fabric
JEC COMPOSITES MAGAZINE - Issue #81 - May/June 2013 - 55
JEC COMPOSITES MAGAZINE - Issue #81 - May/June 2013 - 56
JEC COMPOSITES MAGAZINE - Issue #81 - May/June 2013 - 57
JEC COMPOSITES MAGAZINE - Issue #81 - May/June 2013 - 58
JEC COMPOSITES MAGAZINE - Issue #81 - May/June 2013 - 59
JEC COMPOSITES MAGAZINE - Issue #81 - May/June 2013 - Cost prediction
JEC COMPOSITES MAGAZINE - Issue #81 - May/June 2013 - 61
JEC COMPOSITES MAGAZINE - Issue #81 - May/June 2013 - 62
JEC COMPOSITES MAGAZINE - Issue #81 - May/June 2013 - 63
JEC COMPOSITES MAGAZINE - Issue #81 - May/June 2013 - Automotive
JEC COMPOSITES MAGAZINE - Issue #81 - May/June 2013 - 65
JEC COMPOSITES MAGAZINE - Issue #81 - May/June 2013 - 66
JEC COMPOSITES MAGAZINE - Issue #81 - May/June 2013 - 67
JEC COMPOSITES MAGAZINE - Issue #81 - May/June 2013 - 68
JEC COMPOSITES MAGAZINE - Issue #81 - May/June 2013 - 69
JEC COMPOSITES MAGAZINE - Issue #81 - May/June 2013 - NDT
JEC COMPOSITES MAGAZINE - Issue #81 - May/June 2013 - 71
JEC COMPOSITES MAGAZINE - Issue #81 - May/June 2013 - 72
JEC COMPOSITES MAGAZINE - Issue #81 - May/June 2013 - 73
JEC COMPOSITES MAGAZINE - Issue #81 - May/June 2013 - 74
JEC COMPOSITES MAGAZINE - Issue #81 - May/June 2013 - 75
JEC COMPOSITES MAGAZINE - Issue #81 - May/June 2013 - 76
JEC COMPOSITES MAGAZINE - Issue #81 - May/June 2013 - Carbon
JEC COMPOSITES MAGAZINE - Issue #81 - May/June 2013 - 78
JEC COMPOSITES MAGAZINE - Issue #81 - May/June 2013 - 79
JEC COMPOSITES MAGAZINE - Issue #81 - May/June 2013 - Adhesives
JEC COMPOSITES MAGAZINE - Issue #81 - May/June 2013 - Index
JEC COMPOSITES MAGAZINE - Issue #81 - May/June 2013 - In the world
JEC COMPOSITES MAGAZINE - Issue #81 - May/June 2013 - 83
JEC COMPOSITES MAGAZINE - Issue #81 - May/June 2013 - 84
https://www.nxtbook.fr/newpress/jeccomposites/jcm2211_148
https://www.nxtbook.fr/newpress/jeccomposites/jcm2209_147
https://www.nxtbook.fr/newpress/jeccomposites/jcm2206_146
https://www.nxtbook.fr/newpress/jeccomposites/jcm2204_145
https://www.nxtbook.fr/newpress/jeccomposites/jcm2201_144
https://www.nxtbook.fr/newpress/jeccomposites/jcm211_143
https://www.nxtbook.fr/newpress/jeccomposites/jcm2109_142
https://www.nxtbook.fr/newpress/jeccomposites/jcm2107_141
https://www.nxtbook.fr/newpress/jeccomposites/jcm2105_140
https://www.nxtbook.fr/newpress/jeccomposites/jcm2103_139
https://www.nxtbook.fr/newpress/jeccomposites/jcm-experts-digest-additive-manufacturing-2020
https://www.nxtbook.fr/newpress/jeccomposites/jcm2101_138
https://www.nxtbook.fr/newpress/jeccomposites/jcm2011_Special_Issue4
https://www.nxtbook.fr/newpress/jeccomposites/jcm2011_137
https://www.nxtbook.fr/newpress/jeccomposites/jcm2009_136
https://www.nxtbook.fr/newpress/jeccomposites/jcm2007_135
https://www.nxtbook.fr/newpress/jeccomposites/jcm_2020_Q1_Innovation_Report
https://www.nxtbook.fr/newpress/jeccomposites/jcm2005_Special_Issue3
https://www.nxtbook.fr/newpress/jeccomposites/jcm2005_134
https://www.nxtbook.fr/newpress/jeccomposites/jcm2003_133
https://www.nxtbook.fr/newpress/jeccomposites/jcm2001_132
https://www.nxtbook.fr/newpress/jeccomposites/jcm1911_Special_Issue2
https://www.nxtbook.fr/newpress/jeccomposites/jcm1911_131
https://www.nxtbook.fr/newpress/jeccomposites/jcm1909_130
https://www.nxtbook.fr/newpress/jeccomposites/jcm1907_129
https://www.nxtbook.fr/newpress/jeccomposites/jcm1905_128
https://www.nxtbook.fr/newpress/jeccomposites/jcm1903_Special_Issue1
https://www.nxtbook.fr/newpress/jeccomposites/jcm1903_127
https://www.nxtbook.fr/newpress/jeccomposites/jcm1901_126
https://www.nxtbook.fr/newpress/jeccomposites/jcm1811_125
https://www.nxtbook.fr/newpress/jeccomposites/jcm1810_124
https://www.nxtbook.fr/newpress/jeccomposites/jcm1808_123
https://www.nxtbook.fr/newpress/jeccomposites/jcm1807_122
https://www.nxtbook.fr/newpress/jeccomposites/jcm1805_121
https://www.nxtbook.fr/newpress/jeccomposites/jcm1804_120
https://www.nxtbook.fr/newpress/jeccomposites/jcm1803_119
https://www.nxtbook.fr/newpress/jeccomposites/jcm1802_119-Supplement_Innovation_Report
https://www.nxtbook.fr/newpress/jeccomposites/jcm1801_118
https://www.nxtbook.fr/newpress/jeccomposites/jcm1711_117
https://www.nxtbook.fr/newpress/jeccomposites/jcm1710_116
https://www.nxtbook.fr/newpress/jeccomposites/jcm1708_115
https://www.nxtbook.fr/newpress/jeccomposites/jcm1707_114
https://www.nxtbook.fr/newpress/jeccomposites/jcm1706_113
https://www.nxtbook.fr/newpress/jeccomposites/jcm1704_112
https://www.nxtbook.fr/newpress/jeccomposites/jcm1703_111
https://www.nxtbook.fr/newpress/jeccomposites/jcm1701_110
https://www.nxtbook.fr/newpress/jeccomposites/jcm1611_109
https://www.nxtbook.fr/newpress/jeccomposites/jcm1610_108
https://www.nxtbook.fr/newpress/jeccomposites/jcm1608_107
https://www.nxtbook.fr/newpress/jeccomposites/jcm1607_106
https://www.nxtbook.fr/newpress/jeccomposites/jcm1605_105
https://www.nxtbook.fr/newpress/jeccomposites/jcm1604_104
https://www.nxtbook.fr/newpress/jeccomposites/jcm1603_103
https://www.nxtbook.fr/newpress/jeccomposites/jcm1601_102
https://www.nxtbook.fr/newpress/jeccomposites/jcm1511_101
https://www.nxtbook.fr/newpress/jeccomposites/jcm1510_100
https://www.nxtbook.fr/newpress/jeccomposites/jcm1509_99
https://www.nxtbook.fr/newpress/jeccomposites/jcm1507_98
https://www.nxtbook.fr/newpress/jeccomposites/jcm1505_97
https://www.nxtbook.fr/newpress/jeccomposites/jcm1504_96
https://www.nxtbook.com/newpress/jeccomposites/jcm1503_95
https://www.nxtbook.com/newpress/jeccomposites/jcm1501_94
https://www.nxtbook.com/newpress/jeccomposites/jcm1412_93
https://www.nxtbook.com/newpress/jeccomposites/jcm1410_92
https://www.nxtbook.com/newpress/jeccomposites/jcm1409_91
https://www.nxtbook.com/newpress/jeccomposites/jcm1406_90
https://www.nxtbook.com/newpress/jeccomposites/jcm1405_89
https://www.nxtbook.com/newpress/jeccomposites/jcm1404_88
https://www.nxtbook.com/newpress/jeccomposites/jcm1403_87
https://www.nxtbook.com/newpress/jeccomposites/jcm1401_86
https://www.nxtbook.com/newpress/jeccomposites/jcm1311_85
https://www.nxtbook.com/newpress/jeccomposites/jcm1310_84
https://www.nxtbook.com/newpress/jeccomposites/jcm1308_83
https://www.nxtbook.com/newpress/jeccomposites/jcm1307_82
https://www.nxtbook.com/newpress/jeccomposites/jcm1305_81
https://www.nxtbook.com/newpress/jeccomposites/jcm1304_80
https://www.nxtbook.com/newpress/jeccomposites/jcm1303_79
https://www.nxtbook.com/newpress/jeccomposites/jcm1301_78
https://www.nxtbook.com/newpress/jeccomposites/jcm1212_77
https://www.nxtbook.com/newpress/jeccomposites/jcm1210_76
https://www.nxtbook.com/newpress/jeccomposites/jcm1208_75
https://www.nxtbook.com/newpress/jeccomposites/jcm1207_74
https://www.nxtbook.com/newpress/jeccomposites/jcm1206_73
https://www.nxtbook.com/newpress/jeccomposites/jcm1204_72
https://www.nxtbook.com/newpress/jeccomposites/jcm1203_71
https://www.nxtbook.com/newpress/jeccomposites/jcm1201_70
https://www.nxtbook.com/newpress/jeccomposites/jcm1111_69
https://www.nxtbook.com/newpress/jeccomposites/jcm1110_68
https://www.nxtbook.com/newpress/jeccomposites/jcm1108_67
https://www.nxtbook.com/newpress/jeccomposites/jcm1107_66
https://www.nxtbook.com/newpress/jeccomposites/jcm1105_65
https://www.nxtbook.com/newpress/jeccomposites/jcm1104_64
https://www.nxtbook.com/newpress/jeccomposites/jcm1103_63
https://www.nxtbook.com/newpress/jeccomposites/jcm1101_62
https://www.nxtbook.com/newpress/jeccomposites/jcm1011_61
https://www.nxtbook.com/newpress/jeccomposites/jcm1010_60
https://www.nxtbook.com/newpress/jeccomposites/jcm1009_59
https://www.nxtbook.com/newpress/jeccomposites/jcm1006_58
https://www.nxtbook.com/newpress/jeccomposites/jcm1005_57
https://www.nxtbook.com/newpress/jeccomposites/jcm1004_56
https://www.nxtbook.com/newpress/jeccomposites/jcm1003_55
https://www.nxtbook.com/newpress/jeccomposites/jcm1001_54
https://www.nxtbook.com/newpress/jeccomposites/jcm0911_53
https://www.nxtbook.com/newpress/jeccomposites/jcm0910_52
https://www.nxtbook.com/newpress/jeccomposites/jcm0909_51
https://www.nxtbook.com/newpress/jeccomposites/jcm0907-08_50
https://www.nxtbook.com/newpress/jeccomposites/jcm0906_49
https://www.nxtbook.com/newpress/jeccomposites/jcm0904_48
https://www.nxtbook.com/newpress/jeccomposites/jcm0903_47
https://www.nxtbook.com/newpress/jeccomposites/jcm0901_46
https://www.nxtbook.com/newpress/jeccomposites/jcm0811_45
https://www.nxtbook.com/newpress/jeccomposites/jcm0810_44
https://www.nxtbook.com/newpress/jeccomposites/jcm0809_43
https://www.nxtbook.com/newpress/jeccomposites/jcm0807_42
https://www.nxtbook.com/newpress/jeccomposites/jcm0806_41
https://www.nxtbook.com/newpress/jeccomposites/jcm0805_40
https://www.nxtbook.com/newpress/jeccomposites/jcm0803_39
https://www.nxtbook.com/newpress/jeccomposites/jcm0801_38
https://www.nxtbook.com/newpress/jeccomposites/jcm0712_37
https://www.nxtbook.com/newpress/jeccomposites/jcm0710_36
https://www.nxtbook.com/newpress/jeccomposites/jcm0709_35
https://www.nxtbook.com/newpress/jeccomposites/jcm0707_34
https://www.nxtbook.com/newpress/jeccomposites/jcm0706_33
https://www.nxtbookmedia.com