摘要
研究张开型粘弹塑性界面断裂。用傅立叶正、余弦变换及逐段定积分变换方法将边值问题的控制方程化为奇异积分方程组。解方程后计算了裂纹尖端塑性区尺寸及裂纹尖端张开位移(COD:crack tipopeningdisplacement),并给出了能量释放率算式。结果表明,裂纹尖端塑性区尺寸和COD均随两种材料的最小屈服极限的增加而减小;随时间的增大,COD先增长后衰减,最后渐近地逼近于定值。
The problem of viscoelastroplastic interfacial fracture is investigated. By using Fourier-cosine transformation and definite integral transformation, the equations governing the boundary value problems are converted to a group of singular equations. The solutions are used to calculate the plastic zone length of the crack tip and the crack-tip opening displacement (COD), and the equation of energy release rate is obtained. The results show that the plastic zone length of the crack tip and COD reduce with the increase of minimum yield ultimate of two isotropic viscoelastroplastic materials, while COD raises and then drops down to approach constant value as the time passes.
出处
《固体火箭技术》
EI
CAS
CSCD
北大核心
2004年第2期133-135,共3页
Journal of Solid Rocket Technology
基金
湖南省自然科学基金项目(02JJY2014)
湖南大学重点科学基金资助
中国博士后科学基金资助。
关键词
界面裂纹
裂纹尖端
粘弹塑性
双材料
断裂力学
D-B模型
Boundary value problems
Cracks
Fourier transforms
Interfaces (materials)
Plasticity
Viscoelasticity
