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- Material Quality and Crack Initiation. 原料质量、及初始裂纹的寿命。
- The fractography of the fatigue crack initiation displayed cleavage f... 裂纹形成的断裂为穿晶解理机制,预应变可导致更多的二次裂纹。
- Crack initiation and propagation process in A356 aluminium alloy under impact load have been investigated. 研究了A356铝合金在冲击载荷作用下的裂纹萌生及其扩展过程。
- For the notched specimens, there are multiple crack initiation sites on the fractography. 瞬断区所承受的断裂应力随循环应力升高而降低；
- The evaluation of crack initiation life is directly affected bythe reliability of nondestructive testing. 检测方法的可靠性直接影响结构疲劳裂纹形成寿命估计值。
- The threshold of the fatigue crack initiation from the notch of the microbeam is close to that of the bulk material. 疲劳裂纹从尖缺口处萌生的门槛值接近块体材料。
- The addition of AlO_2 tended to shorten the period of time for crack initiation, whereas to retard crack propagation. 对钢的应力腐蚀存在双重影响,即促进裂纹萌生,同时又对裂纹扩展起抑制作用。
- Biaxial analysis was used to get the multiaxial information, and fatigue calculation of multiaxial crack initiation was conducted. 寿命预测采用多轴裂纹萌生疲劳分析，其中部件的多轴特性通过二轴分析获得。
- Fractography analyses with scanning electron microscopy (SEM) were conducted to investigate the corrosion fatigue crack initiation mechanism. 此外，亦利用扫描式电子显微镜(SEM)观察破断面，以了解疲劳破坏机制。
- Experiments demonstrate that leaf spring crack results from rust spot as fatigue crack initiation,and in order to improve spring life it must be to improve coating quality. 通过试验证明了锈点是导致钢板弹簧断裂的新的疲劳源,为提高弹簧的使用寿命必须提高其涂层质量。
- The microprocess of crack initiation and propagation in pearlite under fensile loading has been investigated by in situ observation using a transmission electron microscope. 在透射电镜中进行动态拉伸原位观察珠光体裂纹萌生与扩展的微观过程。
- Discontinuous shot-peening can lead to crack initiation at the tensile surface stresses adjacent to edges of abrupt compressive layer runouts (no fadeout). 受表面张力作用，不连续喷丸会导致在压缩层过渡段突变的边沿出现裂纹。
- The pre-straining prolonged the fatigue crack initiation life, and increased resistance coefficient and equivalent stress threshold of the fatigue crack initiation. 预应变可以延长疲劳裂纹形成寿命，提高疲劳裂纹形成的抗力系数和裂纹形成的当量应力门槛值；
- The results indicate that the crack initiation and propagation mechanism depends on the orientation of pearlite lamellae with respect to the tensile axis. 结果表明:珠光体裂纹萌生与扩展方式取决于珠光体层片和拉伸轴的位向关系。
- The U-notch specimens were used to investigate the fatigue crack initiation life of X60 pipeline steel after pre-tension straining with ductile deformation of 5%, 10% and 15%. 摘要采用U型缺口试样研究了X60管线钢经5%25、10%25和15%25的预拉伸应变后的疲劳裂纹形成寿命。
- Removing or damaging the shot-peened layer can reduce the protection that this compressive layer provides against fatigue and stress corrosion crack initiation. 喷丸压缩层的改变或损坏会降低压缩层抵抗疲劳和应力腐蚀裂纹的保护性。
- The improved local stress-st rain method is introduced.Themechanical model and calculating method are estab lished to evaluate the crack initiation life of membranes. 引入改进的局部应力-应变法，建立计算膜片联轴器膜片疲劳裂纹形成寿命的模型和方法。
- The pre-straining prolonged the fatigue crack initiation life,and increased resistance coefficient and equivalent stress threshold of the fatigue crack initiation. 预应变可以延长疲劳裂纹形成寿命,提高疲劳裂纹形成的抗力系数和裂纹形成的当量应力门槛值;
- "Wedging effect" of corrosion byproducts was analyzed by using 3-D finite element method, and the site of possible fatigue crack initiation was identified. 利用三维有限元法分析腐蚀产物的“楔入效应”，得到最大主应力点的位置，是可能的起裂点。
- Thermal fatigue crack initiation and propagation paths of the high-chromi-um, middle Ni-Cr, adamite(165CrNiM.) and 9Cr2 (the forged steel) rollmaterials have been investigated. Thermal fatigue resistance of the four mater-ials has been evaluated. 本文研究高Cr铸铁、中Ni-Cr激冷铸铁、半钢(165CrNiMo)及锻钢(9Cr2)四种热轧辊材料的热裂纹萌生特点和扩展途径,并对四种材料热疲劳抗力进行了评价。
