Large displacement tensile/compressive testing machine

NSERC RTI申请的请求支持将用于购买高速、高分辨率的数码相机。该装置将广泛用于申请人的NSERC发现基金支持的研究项目中，以研究新型耗能结构。这些设备包括，但不限于，泡沫填充编织管和铝型材经受切割变形。所要求的数码相机将用于获取受切割变形的铝型材在冲击载荷期间的实验观察，以了解(i)刀具的动态运动和（ii）与切割的片状侧壁相关的变形，以便可以开发预测切割力的分析模型。分析模型需要全面了解这些关键点，以评估(i)由于刀具的动态运动而产生的力衰减和（ii）由于弯曲的花瓣侧壁弯曲和周向拉伸而产生的能量耗散机制。此外，该相机将用于获得与泡沫填充编织管的拉伸变形有关的实验观察。具体来说，摄像机将用于捕捉拖曳的弯曲行为和与邻近拖曳相互作用造成的破坏。这些方面对于理解这些管的能量耗散至关重要。

The requested support from the proposed NSERC RTI application will be used to purchase a high speed, high resolution, digital camera. This device will be used extensively in the research program currently supported by the applicant's NSERC Discovery Grant to study novel energy dissipation structures. These devices include, but are not limited to, foam filled braided tubes and aluminum extrusions subjected to cutting deformation. The requested digital camera will be used to acquire experimental observations during impact loading of aluminum extrusions subjected to cutting deformation to understand (i) the dynamic motion of the cutter and (ii) the deformation associated with the cut petalled sidewalls so that analytical models to predict the cutting force can be developed. The analytical models require a thorough understanding of these critical points to assess (i) force attenuation due to the dynamic motion of the cutter and (ii) energy dissipation mechanisms due to bent petalled sidewall bending and circumferential stretching. Additionally, the camera would be used to obtain experimental observations associated with the tensile deformation of foam filled braided tubes. Specifically, the camera would be used to capture tow bending behaviour and failure as a result of interaction with neighboring tows. These aspects are critical in understanding energy dissipation of these tubes. A significant range of applications for the above mentioned energy dissipation devices exist. These include, but are not limited to, automotive, military, aerospace, and personal safety protection applications. The most significant aspect of the use of these devices will be to reduce the severity of injuries or potential of death as a result of falls, automotive crashes, pedestrian impacts, blasts, or bomb explosions. The camera system and requested software would be used extensively during the training of highly qualified personnel. Thus the proposed camera system would act as a tool for research and education and also serve as a device to achieve understanding for the development of energy dissipation devices for use in many safety applications.