The Change in Thermal Expansion Coefficient as a Damage Parameter During Thermal Cycling of Crossply Laminates
The Change in Thermal Expansion Coefficient as a Damage Parameter During Thermal Cycling of Crossply Laminates
复制标题
交错层合板热循环过程中作为损伤参数的热膨胀系数的变化
DOI：
10.1520/stp24729s
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发表时间：
1993
期刊：
影响因子：
--
通讯作者：
P. Smith
中科院分区：
文献类型：
--
作者：
L. Boniface;S. Ogin;P. Smith
对 90° 层板开裂对正交层合板热膨胀系数的影响进行了实验和理论研究。实验发现，热膨胀系数降低高达 50%，这是由机械引起的 90° 帘布层裂纹引起的，尽管在实验中需要相当小心。使用简单的剪切滞后分析对该行为进行建模，并将所得的分析表达式与文献中可用的其他方法进行比较。研究了严格热循环（77 至 373 K）下模型 GFRP 系统中基体裂纹的增长。除了 90° 铺层裂纹之外，膨胀系数的变化还受到 0° 铺层裂纹扩展的影响。将裂纹扩展速率/循环应变能释放速率范围数据与先前报告的类似材料的机械疲劳循环数据进行比较。如果按照断裂力学参数绘制，这两个数据集是一致的，该参数旨在解释材料特性的温度依赖性。
An experimental and theoretical study of the effects of 90° ply cracking on the thermal expansion coefficients of crossply laminates has been carried out. It has been found experimentally that reductions in the coefficient of thermal expansion of up to 50% are caused by 90° ply cracks induced mechanically, although considerable care is needed in the experimentation. This behavior was modeled using a simple shear-lag analysis, and the resulting analytical expressions are compared with other approaches available in the literature. The growth of matrix cracks in a model GFRP system under severe thermal cycling (77 to 373 K) is investigated. The changes in expansion coefficient are affected by the growth of 0° ply cracks in addition to the 90° ply cracks. The crack growth rate/cyclic strain energy release rate range data are compared with those reported previously for mechanical fatigue cycling of similar material. The two data sets are consistent if plotted in terms of a fracture mechanics parameter which aims to account for the temperature dependence of material properties.