Experimental and numerical investigations on dynamic response of butt-welded plates subjected to blast load

IF 5.1 2区 工程技术 Q1 ENGINEERING, MECHANICAL
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Abstract

Experimental and numerical investigations on the small-size butt-welded plates subjected to air blast loads were conducted to highlight the effect of welded joints on the blast proof structures. The inherent characteristics of welded joints, including geometry, mechanical properties and welding residual stress were evaluated and discussed in the computation of blast loading. The geometry shape was assessed through macrographic of the welded joints. The distribution of mechanical and thermal physics property was determined through basic experiments using the specimens extracted from different zones of a welded joint. Welding residual stress was calculated in a thermo-mechanical coupled model. Conventional Weapons Effects Program (CONWEP) is more economic but limited compared with Arbitrary-Lagrangian–Eulerian (ALE) method. ALE and CONWEP methods were applied to simulate the air blast load applied on the plates. Effectiveness and efficiency of the methods were discussed. The results of the two programs could both coincide well with the experiment measurements. The models under six conditions were calculated to uncouple and discuss the effect of material property distribution and welding residual stress on the dynamic response of the welded structure. Permanent deflections were considered to assess the capacity of welded structures. Welding residual stress fields and the local weak materials are advantageous to the bending deformation. The phenomenological expressions of permanent deflection across thickness under different welding conditions were established based on simulation results. The effect of aspect ratio of the welded structures was also be discussed.

承受爆炸荷载的对接焊接板动态响应的实验和数值研究
对承受空气爆炸荷载的小型对接焊接板进行了实验和数值研究,以突出焊接接头对防爆结构的影响。在计算爆炸荷载时,对焊接接头的固有特性,包括几何形状、机械性能和焊接残余应力进行了评估和讨论。几何形状是通过对焊接接头的宏观成像进行评估的。通过使用从焊接接头不同区域提取的试样进行基本实验,确定了机械和热物理特性的分布。焊接残余应力通过热机械耦合模型进行计算。与任意-拉格朗日-欧拉(ALE)方法相比,常规武器效应程序(CONWEP)更经济,但也有局限性。ALE 和 CONWEP 方法被用于模拟施加在板材上的空气爆炸载荷。讨论了这两种方法的有效性和效率。两个程序的结果都能很好地与实验测量结果相吻合。对六种条件下的模型进行了计算,以消除和讨论材料特性分布和焊接残余应力对焊接结构动态响应的影响。考虑了永久挠度以评估焊接结构的承载能力。焊接残余应力场和局部薄弱材料对弯曲变形有利。根据模拟结果,建立了不同焊接条件下跨厚度永久挠度的现象表达式。此外,还讨论了焊接结构高宽比的影响。
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来源期刊
International Journal of Impact Engineering
International Journal of Impact Engineering 工程技术-工程:机械
CiteScore
8.70
自引率
13.70%
发文量
241
审稿时长
52 days
期刊介绍: The International Journal of Impact Engineering, established in 1983 publishes original research findings related to the response of structures, components and materials subjected to impact, blast and high-rate loading. Areas relevant to the journal encompass the following general topics and those associated with them: -Behaviour and failure of structures and materials under impact and blast loading -Systems for protection and absorption of impact and blast loading -Terminal ballistics -Dynamic behaviour and failure of materials including plasticity and fracture -Stress waves -Structural crashworthiness -High-rate mechanical and forming processes -Impact, blast and high-rate loading/measurement techniques and their applications
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