It is a fact that no structural material is perfectly elastic. 事實(shí)上沒(méi)有一種結構材料是十全十美的彈性體。
Corrugated board is a kind of sandwich structural materials and it can be studied as an orthotropic sandwich plate. 摘要瓦楞紙板是夾層結構材料中的一種,可以將其作為正交各向異性的夾層板來(lái)進(jìn)行研究。