Abstract
In this study, the behaviour of elastic stress wave propagating two connected cylindrical bodies was examined using dynamic finite element method (FEM). They consist of two bodies with different cross-sectional area, different Young’s modulus and identical mechanical impedance. It was found that when an incident wave passes through the boundary step between two different cross-sectional areas, a pair of reflected waves which has the same amplitude and opposite sign was observed, despite the same mechanical impedance. This phenomenon appears to be caused by the loading and unloading the boundary section due to the arrival and the passage of incident wave. It was also found that a connection manner to insert the smaller diameter cylinder into the other cylinder with a little length is quite effective for the reduction of the reflected wave, because of the superposition of waves from two edges and control of local deformation. This phenomenon was verified by a series of impact experiments using two cylindrical bodies connected by interference fit.
Highlights
Lightweight structures constructed by the materials with high strength have been used for airplane and space crafts and cars and railway vehicles
When a stress wave generally passes through a boundary between two bodies with different mechanical impedance, the transmitted and reflected waves are usually generated [2,3]
The other one has interference fit which has a hole with slightly small diameter of dH = 15.9 mm to make different connecting conditions
Summary
Lightweight structures constructed by the materials with high strength have been used for airplane and space crafts and cars and railway vehicles. This is because they offer us the reduction of running cost and of energy consumption which may be eco-friendly. It is essential to use a safety factor as small as possible [1]. The optimally designed structures are usually thin, slim. In such lightweight and complex structures subjected to impact loading, relatively large stress concentration due to the superposition of stress waves appears. When a stress wave generally passes through a boundary between two bodies with different mechanical impedance, the transmitted and reflected waves are usually generated [2,3]
Sign-in/Register to view highlights & summary Sign-in/Register to access full text options 
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a callDisclaimer: All third-party content on this website/platform is and will remain the property of their respective owners and is provided on "as is" basis without any warranties, express or implied. Use of third-party content does not indicate any affiliation, sponsorship with or endorsement by them. Any references to third-party content is to identify the corresponding services and shall be considered fair use under The CopyrightLaw.
