Concerning on the modeling of the quasi - brittle fracture process at interface cracks of quasi - brittle materials , a comparative analysis was performed based on some typical constitutive models of interface cracks 摘要以混凝土界面断裂分析为目的，选取若干典型的层间界面准脆性断裂的本构模型进行分析和数值模拟对比研究。
Results show that the brittle fracture is mainly caused by hydrogen brittleness that results from the oxidation arid absorbing hydrogen of copper tube during braze welding 同时在加热和冷却时，由于异种材料的热胀系数差别过大，产生的较大热应力作用于已存在的裂纹，促使裂纹二次扩展，甚至使得晶粒脱落产生空洞，最终导致焊接接头漏气失效。
But during the 1994 northridge earthquake in america and 1995 hyogoken - nanbu earthquake in japan , steel frames were seriously damaged , and many of which were brittle fracture at the connections 然而，在1994年发生在美国的northridge地震和1995年发生在日本的阪神地震中，钢结构框架发生了严重的破坏，而且大多都是发生在节点处的脆性破坏。
Beam column connections experienced a great deal of brittle fracture phenomenon in northridge earthquake and hyogoken - nanbu earthquake which indicated that connection performance is very important for steel frames 发生在美国北岭和日本阪神地震都发生不同程度的梁柱节点脆性破坏,可见梁柱节点在多层钢框架结构抗震设计中占有非常重要的地位。
In order to contract and to predict the brittle fracture behavior of welded - bolted beam - to - column joints under cyclical load , on the basis of experiments , software ansys was adopted to analysis the results 为了便于比较，为了更加精确地模拟梁柱焊接和螺栓共同连接的形式在循环荷载作用下的脆断行为，本文在试验的基础上，采用了有限元软件ansys进行了分析。
Abstract : the inertial effect of three - point bend specimens under impactloading was analyzed by using the spring - mass system model and an expression for the correction of inertial force was obtained under the condition of brittle fracture of materials 文摘:用弹簧质量模型分析了三点弯曲试样在冲击载荷作用下的惯性效应，得到了脆性断裂条件下有效载荷的修正公式。
To research connection behavior under seismic action in multi - story steel frames and to improve ductility as well as anti - seismic ability in case brittle fracture has great theoretical value and project significant in building construction 因此,钢框架梁柱节点抗震性能的研究对多层钢框架改善结构延性、防止节点发生脆性破坏、提高结构抗震能力有着重要的理论意义和工程意义。
Under the tensile stress , the fracture mode of za27 alloyed with si or mn is a mix type fracture - the plastic fracture and the brittle fracture are coexistence . cracks are mainly stemmed from brittle phases of si and mn and develop along the grain boundary 适宜的加锰量为0 . 4 - 0 . 8 ；在拉伸应力作用下加入si或mn后的za27 ，合金的断裂均为混合型断裂，既有塑性断裂，也有脆性断裂。
But during the 1994 northridge earthquake and 1995 hyogoken - nanbu earthquake , beam - to - column connections experienced a great deal of brittle fracture phenomenon , which indicated that the performance on the damage mechanism of some style joints were rather inadequate 但在1994年northridge和1995年阪神地震中，梁柱连接发生了大量的脆断现象，显示出了人们对于钢框架梁柱栓焊连接节点认识上的不足。
The fractorgraphy analysis show that in the layer rich in w and mo , the feature of fracture is brittle fracture which follow the bordline of crystal . in sections rich in the felt metal , the feature of fracture is ductile fracture . in w - mo layer , the feature of fracture are brittle fracture and some ductile fracture 断口形貌特征研究表明，富w区、富mo区主要为沿粒界脆性断裂；粘结金属发生韧性断裂； w - mo混合区为颗粒的沿粒界脆性断裂和粘结相的韧性断裂的混合型断裂；富ti区为典型的穿晶解理断裂； mo - ti混合区以穿晶解理断裂为主，颗粒边界表现出准解理断裂特征。
