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).

金属结构材料的损伤和失效行为与局部应力状态密切相关。损伤模型用于评估材料和部件的完整性以及模拟以损伤控制为目的的成形过程，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一种测试技术，在这种技术的帮助下，可以以定义的方式设置试样中的应力状态。然而，这种测试技术目前在申请人的设施中不可用。相反，应力状态是通过在单轴测试的框架内调整试样的几何形状来产生的，因此既不能设置任意的应力状态，也不能可靠地避免非比例应变路径。这可以通过所申请的测试机来解决，该测试机将法向应力和剪应力叠加到由内压产生的静水应力上，从而能够系统地设置特定的应力状态。所申请的试验机是一种独特的机器，在制造商的目录中找不到，因为除了拉伸/压缩以及扭转试验外，它还提供对空心试样施加内部压力。因此，机器必须单独地适应申请人的愿望，如本提案中所述。从这个意义上说，该试验机在亚琛的位置是独一无二的。由于三家申请人都隶属于金属设计中心，因此该中心被选为该试验机的位置。这种位置的选择确保了所有申请人对机器的最佳使用。该试验机还将被集成到由材料科学与工程部创建的虚拟StrucMatLab中。这将在后续工作和维护成本方面发挥协同效应，并进一步增加科学家，特别是地球资源与材料工程学院的科学家对机器的可访问性。许多正在进行或刚刚申请的研究项目将受益于测试机的采购，涵盖基础科学和更多的应用型项目，从材料科学和材料工程，生产工程（成型技术）和土木工程（钢结构）领域。