The objective of the paper is to study the effect of negative Poisson's ratio on the crack tip field under the application of external mechanical load and temperature. Explicit and analytical expressions for the fracture mechanics parameters such as stress intensity factors and the energy release rate are obtained. The expressions for the thermal loads are derived in axisymmetric cylindrical coordinates under the framework of steady-state uncoupled linear thermoelasticity. Numerical results are presented graphically to demonstrate the effect of negative Poisson's ratio on the crack tip field. The results show that for the case of applied mechanical loads, materials with negative Poisson's ratio have higher energy release rate. However, if the applied are thermal loads, the crack tip fracture mechanics parameters are significantly decreased.

本文的目的是研究在外部机械载荷和温度作用下负泊松比对裂纹尖端场的影响。获得了应力强度因子和能量释放速率等断裂力学参数的显式和解析表达式。在稳态非耦合线性热弹性框架下，在轴对称圆柱坐标系中导出了热负荷的表达式。数值结果以图形方式给出，以证明负泊松比对裂纹尖端场的影响。结果表明，在施加机械载荷的情况下，泊松比为负的材料具有更高的能量释放率。但是，如果施加的是热负荷，