Static and fatigue testing of partial penetration groove welds in aluminum structures**

铝结构部分熔透坡口焊缝的静态和疲劳测试**

• 批准号: 533720-2018
• 负责人: Walbridge, Scott
• 金额: $ 1.8万
• 依托单位: University of Waterloo
• 依托单位国家: 加拿大
• 项目类别: Engage Grants Program
• 财政年份: 2018
• 资助国家: 加拿大
• 起止时间: 2018-01-01 至 2019-12-31
• 项目状态: 已结题
• 来源: https://www.nserc-crsng.gc.ca/ase-oro/Details-Detailles_eng.asp?id=667963
• 关键词: Static; fatigue; testing; partial; penetration

Canadian designers of aluminum structures are encountering a challenge in the economical design of truss structures, because of restrictions that the Canadian design codes place on the use of partial joint penetration (PJP) groove welds in these structures. In Canada, these welds are currently strongly discouraged by design codes through specific language or penalties in the design strength calculations. A review of international codes reveals that more economical designs would result from using these foreign standards. This has raised some doubt concerning the harsh penalties imposed by the Canadian codes. Against this background, the current project aims to test connections containing PJP welds to investigate the validity of these penalties, and to begin to establish better models for use in design. The main research challenge will be to improve our understanding of the static and fatigue performance of PJP welds in aluminum plate and tubular structures and relate it to the conflicting provisions in the various relevant international structural and weld design codes. 40 laboratory tests are planned to investigate the behaviour of PJP welds in direct tension, as well as in tubular connections. These tests will consider the influence of various factors, such as wall thickness and degree of penetration of the weld, and will also include cyclic (fatigue) loading, which is crucial in bridge applications. The experimental program will be supported with a parallel finite element (FE) analysis study, which will result in a model that can be used in the future to extend the findings to other joint geometries. In order to link the two, digital image correlation (DIC) measurements will be obtained during the structural tests. It is expected that the results of this research will translate to immediate benefits for the industry partner and the local, Canadian-owned aluminum fabricators who fabricate their designs. The results will also be disseminated to benefit others in the Canadian aluminum industry.**********

铝制结构的加拿大设计师在桁架结构的经济设计中遇到了挑战，这是由于加拿大设计代码在这些结构中使用部分关节渗透（PJP）凹槽的限制。在加拿大，这些焊缝目前是通过设计强度​​计算中的特定语言或惩罚来强烈灰心的。对国际规范的综述表明，使用这些外国标准会导致更经济的设计。这引起了人们对加拿大法规施加的严厉处罚的怀疑。在此背景下，当前的项目旨在测试包含PJP焊接的连接，以研究这些惩罚的有效性，并开始建立更好的设计模型。主要的研究挑战是提高我们对铝板和管状结构中PJP焊缝静态和疲劳性能的理解，并将其与各种相关的国际结构和焊接设计代码中的相互矛盾的规定联系起来。计划进行40次实验室测试，以研究PJP焊缝在直接张力以及管状连接中的行为。这些测试将考虑各种因素的影响，例如壁厚和焊缝的穿透程度，还包括环状（疲劳）载荷，这在桥梁应用中至关重要。实验程序将通过平行有限元（FE）分析研究来支持，该研究将导致将来可以使用的模型将发现扩展到其他关节几何形状。为了链接两者，在结构测试期间将获得数字图像相关（DIC）测量。预计这项研究的结果将转化为行业合作伙伴以及制造设计的当地铝制制造商的直接利益。结果还将被传播，以使加拿大铝业行业中的其他人受益。**********