[請益] 關於Material hardening的問題

看板Mechanical (機械)作者 (鳥沈)時間14年前 (2011/10/02 09:23), 編輯推噓1(105)
留言6則, 1人參與, 最新討論串1/2 (看更多)
An isotropic strain hardening material in cylindrical form is stressed in uniaxial tension so that its cross-sectional area reduces from A0 to A1. A strip of the same material is also compressed in plane strain from thickness h0 to h1. The reduction r=1-A1/A0=1-h1/h0 is the smae in both cases. Which, if either, is likely to be hardened more by the reduction, be cylinder or be strip? Why? 完全不知從何下手? -- ※ 發信站: 批踢踢實業坊(ptt.cc) ◆ From: 118.167.193.122

10/02 11:44, , 1F
從strain去判斷吧,截面積是R^2量次,所以面積和厚度縮減一
10/02 11:44, 1F

10/02 11:45, , 2F
樣百分比的狀況,實際上長度改變的應變應只有R^1/2量次,假
10/02 11:45, 2F

10/02 11:46, , 3F
設材料的應力應變曲線是positive hardening的,塑性應變量越
10/02 11:46, 3F

10/02 11:46, , 4F
大者,應該硬化的程度越高。
10/02 11:46, 4F

10/02 11:48, , 5F
因為沒有實際的數據,所以用這樣推論,不然如果考慮到蒲松比
10/02 11:48, 5F

10/02 11:48, , 6F
還有實際材料硬化的行為,很有可能出現完全相反的結論
10/02 11:48, 6F
文章代碼(AID): #1EXxql4T (Mechanical)
文章代碼(AID): #1EXxql4T (Mechanical)