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首页> 外文期刊>Engineering Fracture Mechanics >The toughness of laser welded joints in the ductile-brittle transition
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The toughness of laser welded joints in the ductile-brittle transition

机译：脆性转变中激光焊接接头的韧性

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摘要

An important feature of laser welded joints is the high level of strength and toughness mismatch developed between the weld and the parent plate. As a result, defects are frequently located in regions with high strength and toughness gradients. To address this issue, toughness tests have been performed on laser welded joints with strength mismatches in excess of 2. Toughness tests have been performed on high and low constraint mode I geometries and mixed-mode I/II configurations. In highly constrained geometries, the local toughness dominates the failure process causing the crack to deviate into harder and more brittle weld metal, while in low constraint configurations, the size of the plastic zone promotes crack deviation into the softer and tougher parent plate. In Charpy tests the crack also deviates into the tougher parent plate giving potentially misleading indications of the behaviour of defects in highly constrained joints. The experiments are modelled by a local approach technique for functionally graded materials in which the local yield strength and toughness are allowed to vary spatially.
机译：激光焊接接头的一个重要特征是在焊缝和母板之间形成了很高的强度和韧性失配。结果，缺陷经常位于具有高强度和韧性梯度的区域中。为了解决这个问题，已经对强度不匹配超过2的激光焊接接头进行了韧性测试。已经对高和低约束模式I几何形状和混合模式I / II配置进行了韧性测试。在高度受约束的几何形状中，局部韧性在破坏过程中占主导地位，导致裂纹偏向更硬，更脆的焊缝金属，而在低约束配置中，塑性区的大小会促使裂纹偏向更软，更坚硬的母板。在夏比测试中，裂纹还偏向更坚硬的母板，从而给出了高度受约束的接头中缺陷行为的潜在误导性指示。实验是通过局部方法技术对功能分级材料进行建模的，其中允许局部屈服强度和韧性在空间上变化。

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