货车制动梁端轴采用超声波探伤的建议

提出了货车制动梁轴裂纹故障的超声波探伤方法，并取得了实际效果。     

EQ1170KA客车底盘焊接接头疲劳裂纹扩展速率的研究

本文研究了EQ1170KA客车底盘焊接接头疲劳裂纹扩展速率的规律,结果表明:焊接接头不同部位的疲劳裂纹扩展速率各不相同,焊接残余应力和金相组织对疲劳裂纹扩展速率都有一定的影响。     

希望号储油轮船体局部结构裂纹损伤原因分析

对使役二十年的南海希望号储油轮，进行了总体结构、局部结构计算分析、模拟试验及实测。完成甲板与左舷第５号压载水舱（５Ｐ舱）裂纹处的应变应力实测后又发现左舷第２号压载舱（２Ｐ舱）也存在裂纹及裂纹损伤，在进行２Ｐ舱应变应力实测的同时还对５Ｐ舱裂纹损伤处相对应的前一肋段进行了实测。这些数据对探明损伤原因提供了充分的依据。     

汽车冷挤压模具的十种失效形式与改善措施

通过分析冷挤压模具在生产实践中常发生的十种失效形式，采取不同的对策，充分发挥冷挤压模具的潜力，产生了显著的技术经济和社会效益。     

冰冷车转8A摇枕、侧架裂纹原因及对策

介绍了冰冷车摇枕、侧架裂纹的主要情况，分析了裂纹产生的原因，提出了冰冷车摇枕、侧架裂纹控制的相关对策。     

浅谈桥梁施工中如何克服砼表面缺陷

分析砼结构表面质量缺陷的成因，对如何减少砼表面裂纹、蜂窝麻面、露筋、夹渣、硬伤、缺棱掉角，使其砼表面平整，棱线清晰，色泽一致进行探讨。     

浅谈兖石线桥梁墩台裂纹成因及整治措施

多年来,人们一直认为混凝土是一种非常坚固耐久的材料,混凝土桥梁墩台是很少需要维修的。然而实践表明,既有铁路桥梁墩台的耐久性不容乐观,即桥梁墩台裂纹病害及由此而产生的对承载力及使用功能的不利影响,应引起我们工程及工务部门的高度重视。1　兖石线桥梁墩台裂纹概况兖石线1984年铺架完毕,1986年正式运营。在1986年的春检中发现K217 901高渝河大桥第10号墩左侧有一条宽0.5—2mm、长550mm、深450mm的裂缝,裂缝从墩帽正面经检查梯角钢孔通向侧面,使整个帽石角断裂;K179 024沂河特大桥第34孔钢梁桥左侧支座外侧帽石劈裂,深150mm,长800mm,…     

A review of the effect of a／W ratio on fracture toughness （Ⅰ）—experimental investigation in EPFM

Many experimental investigations have previously been performed and recently done on different shipbuilding structural steels where the specimens size and crack depth/specimen width (a/W) were varied. A series of interesting results have been gained. It is worthwhile to have a review on the effect of a/W ratio on fracture toughness, and further theoretical analysis is necessary. In this paper, experimental work in elasticplastic fracture mechanics (EPFM) was discussed. Tests had been carried out on 10 kinds of strength steels. Results showed that J _i and δ₁ values increased with decreasing a/W when a/W<0.3 for three-point bend specimens and that shallow crack specimens which have less constrained flow field give markedly higher values of toughness than deeply notched specimens. However, for a/W>0.3, the toughness was found to be independent of a/W. Slip line field analysis shows that for shallow cracks, the hydrostatic stress is lower than that from standard deeply cracked bend specimen which develops a high level of crack tip constraint, provides a lower bound estimate of toughness, and will ensure an unduly conservative approach when applied to structure defects especially if initiation values of COD/J-integral are used.