國產12代altis剛性真的好嗎? - 福特
By Olivia
at 2019-10-19T22:43
at 2019-10-19T22:43
Table of Contents
引用MunezSu的圖
https://i.imgur.com/36PSBgf.jpg
縱軸是應力、橫軸是應變,應力除以應變(斜率)就是模數用E表示
例如鋼材模數約207 GPa
也就是說在拉伸應力受207 MPa下的應變是0.001,等於1公尺的會被拉長1mm
鋼材強度跟剛性基本上沒啥關係
即使是高強度鋼材(1500 MPa)和一般強度(390 MPa),只要兩者模數相同
在線性區內相同受力(應力)下的變形量會一樣
那鋼材強度跟車體結構安全性有沒有關係呢?
有,但不是絕對!
假設某鈑件初始設計是980 MPa
但在CAE模擬撞擊時某結構件會受1200 MPa應力,那該鈑件會進行設變
1. 改用更高強度鋼材
2. 改變結構幾何設計(有效分散應力,降低應力集中)
3. 增加補強件reinforcements(降低應力集中)
但在沒有整車結構幾何設計、鈑件間搭接形式、焊點等資訊的前提下
純討論鋼材強度的數字完全沒有意義
甚至就算車體結構資訊都有,沒有用CAE軟體做完整的模擬或是實測
車體結構安全性都仍是未知數
每次都有你在推文亂誤導!
推 nctudaniel : 基本上 除了公佈撞測影片外 不然就公佈全車鋼材mpa10/18 23:09
→ nctudaniel : 分佈 才比較有參考價值10/18 23:09
→ nctudaniel : 這是最基本要求 神A既沒公佈全車mpa數 撞測影片也10/18 23:10
→ nctudaniel : 用動畫模擬..10/18 23:10
在設計階段用CAE軟體模擬評估撞擊測試是主流車廠的能力
安全性的模擬目標是做到定量而非定性,這在求解非線性碰撞上非常困難
光建立一個完整的車輛碰撞模型就得花整個團隊好幾週的工作時間
白車身薄殼元素,焊點搭接、膠合,詳細材料拉伸曲線
而碰撞非線性用顯式積分(explicit)對有限元素的品質特別要求
時域的分析取樣的單位時間點加上材料非線性跟接觸問題
即使是HPC實際執行碰撞運算也可能要數周時間
你以為是隨便做做動畫喔.....
推 vivi8770 : 這代有買,壓車頂板金,可以壓的下去10/19 08:08
→ vivi8770 : 上台福特,車頂板金硬多了 10/19 08:09
推 vivi8770 : 保桿的硬度也是,壓壓看就知道,福特比較硬10/19 08:23
還在看鈑金硬度.....要比硬度前擋玻璃可是比鈑金件高喔
隨便找個CAE碰撞分析的影片
https://www.youtube.com/watch?v=wwQq7Mwwf1A
是由主樑等作為"結構件"承受撞擊力,鈑金蒙皮對結構安全幾乎沒啥影響
剛性、強度、結構間的關係
不曉得是真的混淆搞不清楚呢,還是故意混淆呢?
其實不用特地發文來昭告天下自己不求甚解
--
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