In any undergraduate courses of Mechanical Engineering, students should have learned Mechanics of Materials and Mechanics of Vibration dealing with tension/compression of rod, torsion of shaft and bending of beam. In addition to such knowledges, basic knowledges of transient phenomena (impact and wave propagation) of such structural elements are also commonly important in Mechanical Engineering as well as in a wide range of Science and Engineering (ex. Seismology). Moreover, the knowledges about impact and wave propagation in solids are important to understand fracture and damage of materials due to impact that have many different aspects compared with static ones. This course provides such knowledges and their applications.
(1) To be able to theoretically consider the deformation and vibration in elastic solids caused by impact in terms of displacement and stress.
(2) To be able to roughly understand impact phenomena of solids with damage and fracture.
Stress Wave, Reflection and Transmission, Acoustic Impedance, Longitudinal Wave, Shear Wave, Guided Wave, Impact and Collision
|✔ Specialist skills||Intercultural skills||Communication skills||Critical thinking skills||Practical and/or problem-solving skills|
This course is given by a Lecture (online livestream) style. A homework related to the subject is imposed almost every week. Numerical computation is required to complete the homework in some cases.
|Course schedule||Required learning|
|Class 1||Impact and wave propagation in solids||To learn the difference between static and dynamic (impact and wave propagation) phnomena.|
|Class 2||Longitudinal impact and wave propagation in rods (one-dimensional wave equation, reflestion and transmission)||To learn and apply the basic equation of longitudinal impact of rod.|
|Class 3||Longitudinal impact and wave propagation in rods (collision of rods, collision of rod and sphere)||To learn the solutions of rod-rod impact and rod-sphere impact problems,|
|Class 4||Impact and wave propagation in shafts and beams||To learn the basic equations for impact of shafts and beams, and to get knowledge of dispersive wave.|
|Class 5||Longitudinal wave and shear wave in three-dimensional medium||To learn that there are only two kinds of waves (longitudinal and shear) in three-dimensional elastic medium.|
|Class 6||Guided waves in three-dimensional medium||To learn that synthetic waves such as Rayleigh and Lamb waves are observed in elastic solids with boundary.|
|Class 7||Damage and fracture due to impact||To learn that damage and fracture due to impact are quite different form those due to static load.|
To enhance effective learning, students are encouraged to spend approximately 100 minutes preparing for class and another 100 minutes reviewing class content afterwards (including assignments) for each class.
They should do so by referring to course material.
Printed resume of the content of lecture will be provided.
Reference books in Japanese and/or English will be introduced in the class.
The understandings and application ability are evaluated through homeworks around five times.
Required knowledges are Mechanics of Materials, Theory of Elasticity and Plasticity, and Vibration Analysis of undergraduate level.