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Effects of Low Level Temperature Cycle on the Delamination Progress in Quasi-isotropic Laminates

低温循环对准各向同性层压板分层过程的影响

基本信息

批准号：
06452347
负责人：
TAKAO Yoshihiro
金额：
$ 4.48万
依托单位：
KYUSHU UNIVERSITY
依托单位国家：
日本
项目类别：
Grant-in-Aid for Scientific Research (B)
财政年份：
1994
资助国家：
日本
起止时间：
1994 至 1996
项目状态：
已结题

来源：
https://kaken.nii.ac.jp/grant/KAKENHI-PROJECT-06452347/
关键词：
Composite Laminates Delamination Thermal Effect Non-Linear Behavior Crack Cyclic Thermal Loadiong

项目摘要

Effects of temperature on the damage propagation and strength of quasi-isotropic laminates [0/45/-45/90]s were investigated. Non-linearity is found to be due to the increase of crack density both in -45 and 90 degree layrs at low temperature of -100 in centigrade and due to the delamination at high temperature of 150 in centigrade. The knee point of stress-strain relation corresponds to the coalescence of delaminations in each interface and the their propagation to the depth direction at both temperatures. Other characteristic phenomena are as follows such as (1) the direction of matrix crack propagation in -45 degree layr, (2) the multi cracks generated along the depth-direction in -45 degree layr, (3) the increase of delamination density between 45/-45 layrs, (4) the progress of the gap between side edges of each layr at high temperature and (5) fiber break cross to the edge surface in 0 degree layr at high temperature.Thermo-mechanical constants were obtained in each temperature and the numerical results based on these data explain the above (3). The followings were also found that the longitudinal Young's modulus at 150 degree in centigrade is 10% less than that of room temperature and that the shear modulus between longitudinal and normal increases at -100 degree in centigrade much more than the other moduli.At high temperature a new carbon fiber reinforced polyimide without toxicity was studied to obtain its delamination characteristics. A new toughness parameter is proposed for the crack with time-dependent behavior near the crack tip under high temperature.

研究了温度对准各向同性层合板[0/45/-45/90]s损伤扩展和强度的影响。非线性是由于-45和90度层在-100 ℃低温下裂纹密度增加和在150 ℃高温下分层所致。应力-应变关系的拐点对应于两种温度下各界面分层的合并及其向深度方向的扩展。在-45 °层内基体裂纹扩展的方向，在-45 °层内沿深度方向沿着产生多条裂纹，45/-45层间分层密度增加，（4）高温下各层侧边间的差距的进展;（5）高温下0 °层内纤维向边缘表面的断裂。在每个温度下获得机械常数，并且基于这些数据的数值结果解释了上述（3）。在150 ℃时，纵向杨氏模量比室温低10%，而在-100 ℃时，纵向与法向之间的剪切模量比其它模量增加得更多。提出了一种新的高温下裂纹尖端随时间变化的韧性参数。