Thermal Fatigue of Solder Joints

焊点的热疲劳

• 批准号: 0140605
• 负责人: Mark Palmer
• 金额: --
• 依托单位: Kettering University
• 依托单位国家: 美国
• 项目类别: Standard Grant
• 财政年份: 2002
• 资助国家: 美国
• 起止时间: 2002-07-01 至 2004-12-31
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=0140605&HistoricalAwards=false
• 关键词: Thermal; Fatigue; Solder; Joints

Funding is provided under this RUI award to permit 8 teams of undergraduatestudents over the course of a two-year period to participate in a continuousresearch project evaluating the thermomechanical fatigue of solder joints. Tomake this experience successful it is proposed to create a unique learningexperience which is a combination of innovative classroom instruction andresearch. A master's student will assist in this project, and by doing so have aunique master's level experience designed to require the evaluation of the workof others, the synthesis of their work with that of the undergraduates and thedevelopment of leadership skills. There are research and teaching components tothis proposed project.Research: Thermomechanical fatigue (TMF) is the leading cause of solder jointfailure in electronic assemblies. TMF of solder joints is difficult to model asthere are many complex and interacting factors effecting the progression ofdamage to the joint. Because of the high homologous temperatures (0.8 or higher)significant microstructural evolution occurs during TMF, changing the propertiesof the material as TMF progresses. An experimentalinvestigation will be conducted to 1) identify those more readily measured materialproperties most likely to affect TMF resistance, 2) evaluate the variousacceleration factors used in TMF testing, and 3) evaluate the role of wetting inTMF failures.As a result of this research much insight into TMF failure will be gained - 1)progress will be made toward the development of an experimentally verifiedenergy model, and 2) the role of wetting in adhesion will be assessed. Thismeans that those considering using lead-free solder alloys will be able to usediagnostic "tools" not currently available -- the combination of materialproperties which correlate to TMF resistance.Teaching: To enable undergraduates to participate in a continuing researchprogram, a unique "classroom" experience will supplement the research. Theseclass sessions will embrace interactive learning techniques, and expose theundergraduates to 1) the necessary theoretical background, 2) the status of theproject, 3) necessary lab techniques including statistical analysis, 4) oral andwritten communication skills, and 5) broader issues including ethics andeconomic impact. All of these subjects will be context based. The philosophy ofthis course is that upper level undergraduates need to perform at the synthesislevel of Bloom's Taxonomy, and their experience is designed to enable them to doso.The master's student will be required to perform at the evaluation level ofBloom's Taxonomy (evaluating the work of the undergraduates) and synthesize thiswork with their own study on wetting, thus participating in a unique integratingexperience. Additionally the student will develop leadership skills, andpossibly be persuaded to pursue a doctoral degree and develop a desire to teach.The master's students experience may also encourage the undergraduates to pursuea graduate degree.It is felt that this comprehensive plan will maximize the chances for successand serve as a demonstration project for others desiring to incorporate researchinto the undergraduate experience and developing a novel masters program.Impact: It is felt that this program can significantly impact undergraduateeducation by serving as a proof of concept in the development of researchoriented courses, generating an appreciation of life-long learning, anddemonstrating the value of undergraduate research to the outside community. Thiswork complements the current work of the PI and lays the foundation for hisfuture plans.

在此RUI奖下提供了资金，以允许在两年期间的8个本科生团队中参加一项评估焊接接头热力学疲劳的连续研究项目。 Tomake这次经历成功了，它提议创建独特的学习经验，这是创新的课堂教学和研究的结合。硕士的学生将协助该项目，并拥有Aunique Master的水平经验，旨在评估他人的工作，与本科生的工作合成和领导技能的发展。研究和教学组件提出了拟议的项目。研究：热机械疲劳（TMF）是电子组装中焊接关节型的主要原因。焊接接头的TMF很难建模，这是许多复杂且相互作用的因素，影响了damage的进展。由于在TMF期间发生了高的同源温度（0.8或更高）的显着微观结构进化，因此随着TMF的进展而改变材料的性质。 An experimentalinvestigation will be conducted to 1) identify those more readily measured materialproperties most likely to affect TMF resistance, 2) evaluate the variousacceleration factors used in TMF testing, and 3) evaluate the role of wetting inTMF failures.As a result of this research much insight into TMF failure will be gained - 1)progress will be made toward the development of an experimentally verifiedenergy model, and 2) the role of wetting将评估粘附。这是那些考虑使用无铅焊料合金的人将能够使用当前尚不可用的“工具” - 与TMF抗性相关的材料杂货的组合。教学：使本科生能够参与持续的研究计划，一项独特的“课堂”体验将补充研究。该课程会议将采用交互式学习技术，并将士兵介绍到1）必要的理论背景，2）该项目的状态，3）必要的实验室技术，包括统计分析，4）口头和撰写的沟通技巧，以及5）更广泛的问题，包括更广泛的问题，包括伦理学和经济影响。所有这些主题将基于上下文。本课程的理念是，上层本科生需要在布鲁姆分类法的合成级别上进行表演，并且他们的经验旨在使他们能够达到doso。师父的学生必须在布鲁姆分类法的评估级别上表演（评估不足的研究工作），并将其与自身的研究一起进行研究，从而使他们的参与效果进行融合，从而在努力中进行了研究。此外，学生还将发展领导能力，并可以说服攻读博士学位并发展教学愿望。师父的学生经验还可以鼓励大学生的毕业生学位。这一全面的计划将最大化成功的机会，以使其具有重要的研究能力，使他们能够充分发展这种努力，使他们能够充满努力的计划：这是一种新颖的进度：使人能够发展出来的计划：这些新颖的人会影响力量。通过在开发研究的课程中作为概念证明的本科教育，产生了对终身学习的欣赏，并阐明了本科研究的价值对外部社区的价值。这项工作补充了PI的当前工作，并为Hisfuture计划奠定了基础。