摘要
利用细观力学对材料断裂机理的认识 ,结合脆性材料常规破坏试验结果 ,提出了一个新的拉断破坏条件 ,该拉断强度条件与常用的几种脆断强度条件相比 ,能更好地解释材料在复杂应力状态下发生的脆断与小塑性韧断。并对常用的断裂力学判据存在的问题进行了讨论 ,通过分析影响裂尖空穴扩张的主要因素 ,给出能适应不同应力状态的新的断裂判据。
Based on the realization of fracture mechanism of materials in mesofracture mechanics, and experimental results of brittle materials failure in the common condition, a new tensile brittle fracture criterion is presented. Compared with traditional strength condition, this strength can better explain materials brittle fracture and small ductile fracture in the complex stress states. Then, a problem arising from criterion of fracture mechanics in common use is discussed, and a new brittle fracture criterion, which is suitable for different stress states, is given by analyzing the main factors influencing void extension in the tip of crack.
出处
《机械强度》
CAS
CSCD
北大核心
2001年第2期222-224,共3页
Journal of Mechanical Strength
关键词
断裂判据
应力三维度
脆性断裂
强度条件
Fracture criterion
three dimensional stress degree
Brittle fracture
Strength theory
