What is stress? Who has ever seen stress? Is stress a physical quantity?
What is stress? Who has ever seen stress? Is stress a physical quantity?
Professor Yi-Heng Chen, Xi’an Jiaotong University, 710049, P.R.China
e-mail: yhchen2 [at] mail.xjtu.edu.cn (yhchen2[at]mail[dot]xjtu[dot]edu[dot]cn)
In fact, this question has been bothering the present author for more than 15 years.