对某车型发动机排气歧管的热疲劳断裂问题进行综合失效分析，并从材料、结构方面提出改进意见。
This paper gives a comprehensive failure analysis on the thermal fatigue crack of engine exhaust manifold and makes an improvement for materials and structures.
尺寸效应是脆性和准脆性材料的一种基本特性，其在结构断裂破坏中表现得尤为明显。
The size effect is the basic characteristic of the brittle material and the quasi-brittle material, which performs significantly during the fracture failure of the structure.
结构钢材的韧性随温度降低而下降，其破坏形态也由塑性屈服向脆性断裂转变，构件的承载力也由强度控制变为材料的韧性控制。
The toughness of steel decreases as temperature drops, its breakage transfers from plasticity to brittleness and the loading capacity is controlled by the toughness, not the strength.
用声发射方法检测了复合材料损伤与断裂的全过程，证明了该结构的合理性与可行性。
The damage and fracture process of the composite are detected by acoustic emission. The experiment proves the simulating structure to be rational and feasible.
对定向断裂复合材料的结构、功能进行了设计和分析，以求达到最优效果。
The best effect is achieved through the analysis and design of structure and function.
目的探讨多孔性三维立体结构生物材料—重组和异种骨（RBX）在运动性前交叉韧带断裂后进行重建过程中的应用效果。
Objective To investigate the effect of recombined bone xenografts(RBX) on the healing of tendon to bone through the way of imageology, histology.
还通过对该复合材料的结构表征初步推测，该复合材料含有硫醇基，由硫-硫键断裂和键合实现能量释放与存储。
From the structural characterization, it is deduced that this composite material includes a polymer with mercaptan attaching to the...
准确测定结构材料中缺陷的尺寸是断裂力学和损伤容限设计在工程中应有的前提。
Determining precisely flaw sizes of structural materials is the basis of the application of fracture mechanics and damage tolerance design to the engineering.
在光、热、氧的作用下，这些聚合物的部分主链与侧苯基断裂，有少量苯乙酮结构生成，导致材料变色。
Under the action of light, heat and oxygen, somemain chains and side benzene groups of these polymers were broken off. A littleacetophenone structures appeared, and made the materials coloured.
这些公式对工程师们在复合材料结构的研究中进行断裂分析或实验研究是非常重要而有用的。
Those equations are very important and useful for engineers doing fracture analysis or experiment studies in composites…
这些公式对工程师们在复合材料结构的研究中进行断裂分析或实验研究是非常重要而有用的。
Those equations are very important and useful for engineers doing fracture analysis or experiment studies in composites…
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