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Power Density - An Alternative Approach to Quantifying Fatigue Failure

发布日期:2017-06-13访问次数: 信息来源:工学院字号:[ ]

Speaker: C. Steve Suh

Abstract: The power density theory is an alternate description of fatigue failure.  It is derived from the concept of power density, which is physically equivalent to the amount of power deposited into a unit volume of the material experiencing dynamic loading.  Power density results from changes in stress magnitude over time. All the stress alternations that occur across a broad bandwidth of frequencies contribute to the accumulation of power density.  Higher frequencies coupled with faster changes in stress contribute more power density.  Once this accumulation reaches a threshold – a fundamental property of the material – it is expected to fail by fatigue.  The power density based methodology is applied to properly interpret the multiaxial vibration fatigue test results reported by Mršnik, Slavič, and Boltežar using computer simulations.  This serves as a feasibility study for the approach, as well as an example of how to apply it.  The power density response of the system is analyzed, and the failure locations are predicted for each of the ten load cases are considered.  The predicted failure locations are in excellent agreement with the experimental results.  Further examination of the approach would result in a better understanding of fatigue failure, thus improving engineering work across many industries.

 

    间:2017年6月14日,下午14:00-17:00

    点:工学院742会议室

联系人:杜岳峰,13466335519

 

欢迎各位老师和同学积极参加。

 

C. Steve Suh is a faculty in the Mechanical Engineering Department at Texas A&M University.  While being the Director of the Institute for Innovation and Design in Engineering (IIDE), he actively promoted university-industry collaborations on developing innovative engineering solutions and providing enhanced design education to engineering students.   A seasoned engineer of years of real-world experience, he has worked with a broad spectrum of companies including Ford Motor, Boeing, Schlumberger, Surgimedics, Shell Global Solutions, and Applied Materials, to name a few, on projects ranging from system integration to manufacturing design to software development.  His interests in 1) nonlinear time-frequency control theory, 2) advanced manufacturing, 3) engineering design theory, 4) ultrafast laser dynamics, 5) 3D microelectronic packaging, and 6) complex networks have resulted in exceeding 170 scientific publications, 9 book chapters and book volumes including “Control of Cutting and Machining Instability: Time-Frequency Approach for Precision, Micro and Nano Machining” and “Machine Tool Vibrations and Cutting Dynamics.”   As the Director of the Nonlinear Engineering and Control Laboratory, Dr. Suh has delivered more than 3 dozens invited speeches on topics ranging from chaos control to innovative design education to dynamic failure theory.  He is currently the Editor-in-Chief of Vibration Testing and System Dynamics, an interdisciplinary journal serving as the forum for promoting dialogues among engineering practitioners and research scholars on the synergy of system dynamics, testing, design, modeling, and education.

 

 

 





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