层状陶瓷的材料力和裂纹力评估方法

发布时间：2018-06-07 03:06

本文选题：J积分 + 材料非均匀性　；参考：《应用数学和力学》2016年07期

【摘要】：用J积分理论分析了层状陶瓷受弯曲载荷作用时J_(far(0)),J far(a),J_(far(a))-J_(far(0))和J_(tip)的特点,这里J_(far(0)),J_(far(a))分别表示无裂纹时和裂纹长度为a时的远场J积分,J_(tip)表示裂尖J积分.裂纹是垂直于界面的表面裂纹,基本假设是裂纹只影响局部应力应变场.由于积分路径所包围的材料界面长度随积分路径变化,导致J_(far(0))和J_(far(a))都随积分路径变化,但当积分路径远离裂纹影响区域时J_(far(a))-J_(far(0))不再随路径变化.J_(far(a))-J_(far(0))可作为非均匀材料断裂的远场驱动力参量,J_(tip)-(J_(far(a))-J_(far(0)))可用来评价材料非均匀性对裂纹扩展驱动力的促进或抑制作用.
[Abstract]:The J integral theory has been used to analyze the characteristics of J _ S _ Farfara _ T _ (J) and J _ S _ T _ T _ T _ T _ T _ T _ (J _ T _ T _ T _ J _ T _ T _ T _ J _ T _ T _ T _ T _ T _ T _ T _ T _ T _ J _ T _ T _ T _ (J _ T _ p) _ _ _ The crack is a surface crack perpendicular to the interface, and the basic assumption is that the crack only affects the local stress-strain field. Because the interfacial length of the material surrounded by the integral path varies with the integral path, both JS and JSP are changed with the integral path. However, when the integral path is far from the area affected by the crack, JSP / Fara / JJ / S / T) can be used as the far field driving force parameter of nonhomogeneous material fracture.) it can be used to evaluate the promoting or inhibiting effect of material heterogeneity on the driving force of crack growth.
【作者单位】：上海工程技术大学飞行学院;
【基金】：国家自然科学基金(51175321)~~
【分类号】：O346.1

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