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首页> 外文期刊>Engineering Fracture Mechanics >Crack arrest testing of high strength structural steels for naval applications
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Crack arrest testing of high strength structural steels for naval applications

机译：海军应用高强度结构钢的裂纹止裂测试

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The crack arrest fracture toughness of two high strength steel alloys used in naval construction, HSLA-100, Composition 3 and HY-100, was characterized in this investigation. A greatly scaled-down version of the wide-plate crack arrest test was developed to characterize the crack arrest performance of these tough steel alloys in the upper region of the ductile-brittle transition. The specimen is a single edge-notched, 152 mm wide by 19 mm thick by 910 mm long plate subjected to a strong thermal gradient and a tensile loading. The thermal gradient is required to arrest the crack at temperatures high in the transition region, close to the expected service temperature for crack arrest applications in surface ships. Strain gages were placed along the crack path to obtain crack position and crack velocity data, and this data, along with the applied loading is combined in a "generation mode" analysis using finite element analysis to obtain a dynamic analysis of the crack arrest event. Detailed finite element analyses were conducted to understand the effect of various modeling assumptions on the results and to validate the methodology compared with more conventional crack arrest tests. Brittle cracks initiation, significant cleavage crack propagation and subsequent crack arrest was achieved in all 15 of the tests conducted in this investigation. A crack arrest master curve approach was used to characterize and compare the crack arrest fracture toughness. The HSLA-100, Comp. 3 steel alloy had superior performance to the HY-100 steel alloy. The crack arrest reference temperature was T_(KIA) = -136 deg C for the HSLA-100 plate and T_(KIA) = -64 deg C for the HY-100 plate.
机译：在这项研究中，表征了两种用于海军建筑的高强度钢合金HSLA-100，成分3和HY-100的抗裂断裂韧性。开发了一种按比例缩小版本的宽板裂纹阻止试验，以表征这些韧性钢合金在韧性-脆性转变上部区域的裂纹阻止性能。样品是一个单边切口，宽152毫米，厚19毫米，长910毫米，承受强烈的热梯度和拉伸载荷。在过渡区域中较高的温度下（接近于水面舰船上的裂纹止裂应用的预期使用温度），需要使用温度梯度才能将裂纹止裂。沿裂纹路径放置应变计，以获得裂纹位置和裂纹速度数据，并使用有限元分析在“生成模式”分析中将这些数据与施加的载荷组合在一起，以获得对裂纹止动事件的动态分析。进行了详细的有限元分析，以了解各种建模假设对结果的影响，并与更常规的止裂试验进行比较，以验证该方法。在该研究中进行的所有15个测试中，均实现了脆性裂纹萌生，明显的裂解裂纹扩展和随后的裂纹阻止。裂纹止裂主曲线方法用于表征和比较裂纹止裂的断裂韧性。 HSLA-100，比较。 3钢合金的性能优于HY-100钢合金。对于HSLA-100板，止裂参考温度为T_（KIA）= -136℃，对于HY-100板，T_（KIA）= -64℃。

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