MRI: Acquisition of a Drop Tower Impact Test Capability at Penn State Erie, The Behrend College

MRI：在宾夕法尼亚州立大学伊利分校贝伦德学院获得落塔冲击测试能力

• 批准号: 2215884
• 负责人: Gregory Dillon
• 金额: $ 38.49万
• 依托单位: Pennsylvania State Univ University Park
• 依托单位国家: 美国
• 项目类别: Standard Grant
• 财政年份: 2022
• 资助国家: 美国
• 起止时间: 2022-09-01 至 2024-08-31
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=2215884&HistoricalAwards=false
• 关键词: MRI; Acquisition; Drop; Tower; Impact

This Major Research Instrumentation (MRI) award supports the acquisition of a drop tower impact test instrument at Penn State Erie, The Behrend College. Many component and structural failures are due to sudden catastrophic fractures that often occur without warning. The discipline that addresses these effects is fracture mechanics. If mechanical loading reach critical levels, catastrophic failure may occur. Understanding the conditions that may lead to fracture requires test facilities that can vary parameters such as temperature, component shape, and impact velocity. Sudden fracture events occur over very small timeframes, like milliseconds or microseconds. This requires high speed camera capability that can capture these events for detailed study. The drop tower impact test instrument has these features and complements a set of other test techniques at Penn State Erie. A wide range of materials, including metals, polymers and composites, can be understood in terms of their fracture behavior and this will enable closer collaboration with industry partners who must design failure resistant parts and structures. This instrument will also enable instruction on fracture and impact in engineering courses at the college level, while also supporting student centered undergraduate research, industrial workforce development in plastics engineering, and a summer outreach program with middle school girls.The primary objective of the research program to be centered on this acquisition is to explore the rate-dependence of the ductile/brittle fracture transition for both longstanding material formulations and new chemistries and microstructure distributions. The scope also includes use of this technique to induce controlled rapid deformation of oriented polymer samples to better understand strain-induced crystallization in thermoplastics, building on established research at Penn State Erie. Several fracture modeling analysis theories have been planned including essential work of fracture, crack opening displacement, crack tip opening displacement, virtual crack closure, and J-integral. All of these have limitations, often imposed by the fundamental material characteristics. In combination with numerical analysis techniques, the data provided by the drop tower impact test instrument capability will allow these modeling approaches to be evaluated, evolved and optimized for a broad range of polymeric, metallic and composite materials. The fundamental goal is to achieve reliable fracture models for materials of variable morphologies and architectures based on accurate characterization of material deformation and crack propagation.This award reflects NSF's statutory mission and has been deemed worthy of support through evaluation using the Foundation's intellectual merit and broader impacts review criteria.

这项主要的研究工具（MRI）奖支持Behrend College Penn State Erie的Drop Tower撞击测试工具的收购。 许多组成部分和结构性故障是由于突然没有警告而发生的突然灾难性骨折。 解决这些影响的纪律是断裂力学。 如果机械负载达到临界水平，则可能发生灾难性的失败。 了解可能导致断裂的条件需要测试设施，这些设施可以改变参数，例如温度，组件形状和冲击速度。 突然的断裂事件发生在很小的时间范围内，例如毫秒或微秒。 这需要高速相机功能，可以捕获这些事件以详细研究。 Drop Tower撞击测试仪器具有这些功能，并在Penn State Erie中补充了一系列其他测试技术。 可以从骨折行为方面理解各种材料，包括金属，聚合物和复合材料，这将使必须与必须设计抗故障零件和结构的行业合作伙伴进行更紧密的合作。 该乐器还将在大学级别的工程课程中进行断裂和影响的指导，同时还支持以学生为中心的本科研究，塑料工程中的工业劳动力发展以及与中学女生一起进行的夏季外展计划。这项研究的主要目标是探索这项收购的综合构造和依赖于新的易位的效率的，这些材料的依赖性依赖于皮革的依赖性，这些材料依赖于皮革的依赖性。分布。该范围还包括使用该技术来诱导定向聚合物样品的受控快速变形，以更好地理解宾夕法尼亚州伊利州既定研究的热塑性塑料中应变诱导的结晶。已经计划了几种断裂建模分析理论，包括裂缝的基本工作，裂纹开口位移，裂纹尖端打开位移，虚拟裂纹闭合和J构成。 所有这些都有局限性，通常是由基本材料特征施加的。 结合数值分析技术，Drop Tower撞击测试仪器能力提供的数据将允许对这些建模方法进行评估，进化和优化，并针对广泛的聚合物，金属和复合材料进行评估。 基本目标是基于对材料变形和裂纹传播的准确表征，实现可变形态和体系结构材料的可靠裂缝模型。该奖项反映了NSF的法定任务，并被认为是值得通过基金会的知识分子优点和更广泛影响的审查标准来通过评估来获得支持的。