Material testing machine for superposition of tension/compression, torsion and internal pressure

拉/压、扭转、内压叠加材料试验机

• 批准号: 466390831
• 金额: --
• 依托单位: Rheinisch-Westfälische Technische Hochschule Aachen
• 依托单位国家: 德国
• 项目类别: Major Research Instrumentation
• 财政年份: 2021
• 资助国家: 德国
• 起止时间: 2020-12-31 至 无数据
• 项目状态: 未结题
• 来源: https://gepris.dfg.de/gepris/projekt/466390831?language=en
• 关键词: Material; testing; machine; superposition; tension

The damage and failure behavior of metallic structural materials is significantly dependent on the local stress state. Damage models, that are used to both evaluate material and component integrity as well as to simulate forming processes with the aim of damage control, describe this stress state dependency by using corresponding material parameters. The calibration of these parameters as well as the validation of the models require a test technique with the help of which the stress states in specimens can be set in a defined manner. However, such a test technique is currently not available at the applicants’ facilities. Instead, the stress state is generated by adjustment of the specimen geometry within the framework of uniaxial tests, whereby neither arbitrary stress states can be set, nor can non-proportional strain paths be reliably avoided. This is to be remedied by the testing machine applied for, which superimposes normal and shear stresses onto hydrostatic stresses generated by internal pressure thus enabling the systematic setting of specific stress states. The applied for testing machine is a unique machine that cannot be found in the manufacturers’ catalogs because, in addition to tensile/compression as well as torsion testing, it also provides for the application of internal pressure to hollow specimens. Therefore, the machine must be individually adapted to the wishes of the applicants as formulated in the present proposal. To this extent, the testing machine will be unique at the Aachen location.As all three applicants are affiliated in the Center for Metallic Design, the center was selected as the location for the machine. This choice of location ensures optimal use of the machine by all applicants. The testing machine is also to be integrated into the virtual StrucMatLab founded by the Division of Materials Science and Engineering. This will leverage synergy effects in terms of follow-up as well as maintenance costs and furthermore, increase the accessibility of the machine for scientists, especially from the Faculty of Georesources and Materials Engineering.Many research projects that are already underway or have just been applied for will benefit from the procurement of the testing machine, covering both basic science and more application-oriented projects from the fields of materials science and materials engineering, production engineering (forming technology) and civil engineering (steel construction).

金属结构材料的破坏和失败行为显着取决于局部应力状态。损害模型用于评估材料和组件完整性以及以损害控制的目的模拟形成过程，并通过使用相应的材料参数来描述这种应力状态依赖性。这些参数的校准以及模型的验证需要测试技术，并在该帮助的帮助下可以以定义的方式设置标本中的应力状态。但是，申请人的设施目前尚不提供这种测试技术。取而代之的是，应力状态是通过在单轴测试框架内调整样品几何形状来产生的，从而无法设置任意应力状态，也无法避免非比例应变路径可靠。这将由应用的测试机对此进行补救，该测试机将正常应力叠加到内部压力产生的静水应力上，从而实现了特定应力状态的系统设置。用于测试机的应用是一台独特的机器，在制造商的目录中找不到，因为除了拉伸/压缩以及扭转测试外，它还提供了内部压力在空心样品中的施加。因此，必须单独适应本提案中提出的应用程序的意愿。在此范围内，测试机将在Aachen的位置是唯一的。由于所有三个应用程序均在金属设计中心，因此中心被选为机器的位置。这种位置的选择可确保所有应用程序对机器的最佳使用。测试机还将集成到由材料科学与工程部建立的虚拟Strucmatlab中。这将在随访以及维护成本以及此外，还要利用协同效应，并增加机器的可访问性，尤其是从地理资源和材料工程学院中。 （钢结构）。