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首页> 外文会议>Proceedings of the 28th international conference on ocean, offshore and arctic engineering 2009 >CTOD Fracture Toughness Tests and Numerical Simulation for Welded Joints of Q370qE
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CTOD Fracture Toughness Tests and Numerical Simulation for Welded Joints of Q370qE

机译：Q370qE焊接接头的CTOD断裂韧性试验和数值模拟

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摘要

In this investigation, Based on BS7448 fracture toughness test experiment standard and DNV-OS-C401, three-point crack tip open displacement (CTOD) bending tests were made using Q370qE base steel, weld seam and heat-affected zone (HAZ) samples at different sample thicknesses and at different temperature to study the elasto-plastic fracture toughness of the materials frequently used in ocean engineering structure, and the results were calculated using the p-V curves. The results show that different CTOD values corresponding to the occurrence of brittle fracture before yield strength, brittle fracture after yield strength, and ductile fracture are related to different material types, thicknesses, temperature; and the CTOD value is made up of elastic part and plastic part, the value of plastic part greatly influence the CTOD value. Finally, using ANSYS commercial software, bending test models all of base steel, welded joint, HAZ with various center through crack sizes were computed by three-dimensional finite element method, from the results of the finite element analysis, the simulated p-V curve was obtained. It could be found that the simulated curve was close with the experimental curves, so the finite element analysis was accurate. And these works also have important project practical value to the ocean engineering structure designer.
机译：在这项研究中，根据BS7448断裂韧性测试实验标准和DNV-OS-C401，使用Q370qE基体钢，焊缝和热影响区（HAZ）样品进行了三点裂纹尖端开放位移（CTOD）弯曲测试。在不同的样品厚度和温度下研究海洋工程结构中常用材料的弹塑性断裂韧性，并使用pV曲线计算结果。结果表明，不同的CTOD值分别对应于屈服强度前脆性断裂，屈服强度后脆性断裂和延性断裂的发生，与不同的材料类型，厚度，温度有关。 CTOD值由弹性部分和塑料部分组成，塑料部分的值对CTOD值影响很大。最后，利用ANSYS商业软件，通过三维有限元方法计算出了所有母材，焊接接头，具有不同中心贯穿裂纹尺寸的热影响区的弯曲试验模型，并通过有限元分析的结果得到了模拟的pV曲线。 。可以发现，模拟曲线与实验曲线接近，因此有限元分析是准确的。这些工作对海洋工程结构设计者也具有重要的工程实践价值。

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