断裂机理

• From macroscopical to microcosmic , from qualitative to quantitative , from fracture surface analysis in fracture failure to fractography about mechanism , it stated position and function of fracture surface analysis in fracture failure analysis and introduced the contents , evidence , fundamental skills and methods of fracture surface analysis and emphasized the development of fractography and the research on fracture micromechanism
  摘要从宏观到微观、从定性到定量、从断裂失效的断口分析到机理研究的断口学，阐述断口分析在断裂失效（事故）分析中的地位和作用，介绍断口分析的内容及其依据、基本技能和方法，著重说明断口学的发展和微观断裂机理的研究。
• Sicp / al matrix composites , with 5 , 15 and 25 % volume fraction of sic particles , were prepared by vacuum hot - pressing sintering processing in this paper . based on mechanics properties , sem observation and energy dispersive x - ray analysis , the interface reaction phenomenon of sicp / al composites made by vacuum hot - pressing sintering , as well as the reinforcement and fracture mechanisms of this composite were analyzed . the dynamic responses of sipc / al composites were studied by a split hopkinson high - speed pressure bar impact system which strain rate was from quasistatic state strain rate ( 3 . 3 10 - 3s - 1 ) to dynamic state strain rate ( 5 . 2 103 s - 1 )
  本研究以武装直升飞机防护装甲材料为研究对象，采用真空热压粉末冶金烧结工艺制备了含sic颗粒体积分数分别为5 、 15和25的sic颗粒增强铝基复合材料，结合其力学性能、扫描电镜和界面微区能谱分析结果，分析了sic _ p al复合材料的真空烧结过程中的界面现象，以及材料增强和断裂机理，并利用hopkinson高速压杆冲击实验系统对其从静态到动态(应变率为3 . 3 10 ~ ( - 3 ) s ~ ( - 1 ) 5 . 2 10 ~ 3s ~ ( - 1 ) )的压缩破坏响应进行了研究，分析了不同体积分数sic _ p al复合材料高应变率压缩载荷下，材料的变形和微观损伤机理，以及利用高速冲击空气炮测定了改复合材料制备剃度复合板的穿透性能。
• And with the introduction of the modulus of elasticity from budiansky method , the general damage model of rock blasting is established in the paper . by use of the ultrasonic wave , rock damage and fracture mechanism and the fragmentation process during blasting are studied , and the theory presented in the paper has been proven
  运用超声波等手段对岩石爆破损伤断裂机理和破坏过程进行了试验研究，分析了不同爆破条件下岩石内部微裂纹的扩展规律、损伤演化和岩石破碎规律，验证了本文理论部分的正确性。
• There are reverse relationships between room - temperature fracture toughness and tensile ductility with the change of grain sizes in two - phase tial - based alloys . but the essence of the reverse relationships is not clear . in order to solve these problems , it is vital to investigate room - temperature fracture mechanisms of tial - based alloys
  另外随着晶粒尺寸的增加tial基合金的室温塑性与断裂韧性呈现相反依赖关系，这种相反依赖关系的本质至今还不是很清楚，要解决这些问题，也必须搞清楚其断裂机理。
• This paper introduces the principle of instrumented impact test method and its application in production and scientific research . emphasis is laid on achievements obtained in the field of developing measurement technique of fracture mechanics , analyzing characteristic parameter of impact curves as well as studying fracture mechanism of materials . in addition , the application and developing trends in the near future are also discussed in the paper
  介绍了仪器化冲击试验方法的基本原理及其在生产和科研中的应用,重点阐述了仪器化冲击试验方法在动态断裂力学测试技术中的开发、冲击曲线参数分析、材料断裂机理研究等领域所取得的成果,并展望了这一方法未来的应用和发展趋势。
• On the basis of theory of fracturing mechanics and damage mechanics , the mechanism of damage and fracture by explosion load has been analyzed and studied deeply . and the calculation of blasting damage in rock is explored further by using the combination of the current model for blasting damage and the simulating blasting experiment
  本文利用断裂力学和损伤力学的理论对岩石在爆炸作用下的损伤断裂机理进行了深入分析和研究，并采用现有的岩石爆破损伤模型和岩石爆破损伤模拟试验相结合的方法，对岩体在爆破作用下产生损伤的计算进行了新的探索。
• In this paper , the problems relevant to the hydrogen embrittlement of titanium alloy has been summarized comprehensively . and based on those vies , the influence of hydrogen on the microstructure and mechanical properties of the titanium alloy ti - 2al - 2 . 5zr was studied , the solubility of hydrogen in the alloy has been measured , hydrogen induced delayed fracture behavior in it has been investigated , and finally the hydrogen induced delayed fracture behavior model was proposed
  本文详细评述了国内外对钛合金的氢脆及相关问题的研究进展，并在此基础上，研究了氢对ti - 2al - 2 . 5zr合金的组织结构和力学性能的影响，测试了氢在该合金中的溶解度，并对其氢致延迟断裂行为进行了分析研究，提出了氢致延迟断裂的断裂机理。
• The constitutive equations were gained by regression analysis and some material constants were derived from that with the aid of om , x - ray , sem and tem , the deformation structure of the mid - strength weldable 1420aluminum - lithium alloy on different hot deformation conditions was studied and the soften mechanism was discussed . at the same time , the fracture behavior has been studied as an important part . the fracture mechanism of 1420 aluminum - lithium alloy was confirmed
  结合金相显微镜、 x -射线衍射、扫描电镜、透射电镜等现代化的试验手段，研究了中强可焊1420铝锂合金热变形不同变形条件下的组织变化及软化机制，分析了不同变形条件对合金材料组织变化的影响，确定了合金材料的软化行为机理；同时，结合合金材料的热变形高温拉伸试验，重点研究了材料的断裂行为，分析了合金材料的断裂现象，探讨了合金材料的断裂机理。
• The main contents of this paper are as follows : 1 . the fracture test results of 87 adhesive specimens of new and old concrete are presented . the failure patterns and main influencing factors of the specimens are discussed and analyzed , such as interfacial roughness , types of adhesive agent , size of the aggregate , adhesive ages of new and old concrete
  进行了四组24水平共计87个新老混凝土粘结试件的断裂试验，讨论了新老混凝土粘结的断裂机理及影响断裂性能的主要因素，如老混凝土界面的粗糙度、界面剂类型、混凝土粗骨料最大粒径、粘结龄期等。