金屬薄板液壓膨脹實驗結合成形極限之設備研發與研究

Development and Study on Integrated Apparatus of Metal Sheet Bulge Test with Forming Limit Diagram

陳彥佑

指導教授 ： 洪景華

國立交通大學/工學院/機械工程系所/碩士(2012年)

https://doi.org/10.6842/NCTU.2012.00456

摘要

為了能夠更便利、更準確並更完整地得金屬薄板的材料性質，如
薄板之應力-應變曲線(stress-strain curve)和成形極限圖(forming limit
diagram)，本研究設計製作一整合的薄板材料實驗設備。首先建立液
壓膨脹實驗(bulge test)設備，取得薄板之應力-應變曲線，並與單軸拉
伸實驗做比較，驗證薄板液壓膨脹實驗之可行性。再以液壓膨脹實驗
設備為基礎，發展一金屬薄板液壓成形極限實驗。使用液壓膨脹實驗
的圓形模具，規劃不同的試片幾何，提出一使用橡膠做為液壓傳遞壓
力的概念，用以取得完整的成形極限圖，並與傳統的衝壓成形極限實
驗比較，驗證薄板液壓成形極限實驗之可行性。最後整合成一薄板材
料實驗之設備，以單一設備並更便利地取得應力-應變關係曲線與成
形極限圖。

關鍵字

液壓膨脹實驗 ； 應力-應變曲線 ； 成形極限圖

並列摘要

To obtain sheet metal’s material properties such as stress-strain
curve and fomring limit diagram. A more convenient and accurate
apparatus of material test for sheet metal has been designed and
manufactured. Firstly, a device of hydraulic bulge test was constructed to
obtain the stress-strain curve and compared with that from uniaxial
tension test to verify the feasibility of hydraulic bulge test. Secondly,
hydraulic forming limit test was conducted based on a modified bulge test
apparatus with a circular die. A new concept that using a PU layer to
uniformly transfer the hydraulic pressure to the sheet matel was proposed
so both the left side and part of the right side of forming limit
diagram(FLD) can be obtained. And the limit strain of the right side of
FLD under equal biaxial tension was also obtained after the bulge test.
The complete forming limit diagram was then compared with that from
traditional drawing test to verify the feasibility of hydraulic forming limit
test. Finally, an integrated testing apparatus for sheet metal with
capabilities to obtain both stress-strain curve and FLD has been
completed and verified.

並列關鍵字

hydraulic bulge test ； stress-strain curve ； forming limit diagram.(FLD)

參考文獻

[11] J.W. Hutchinson and K.W. Neale, "Sheet Necking- II. Time-

[12] Sebastian Dziallach, Wolfgang Bleck, Michael Blumbach and

[1] Z. Marciniak, J.L. Duncan and S.J. Hu. “Mechanics of Sheet Metal

Forming”, Second edition, Butterworth-Heinemann, 2002.

[2] R. Hill, “A theory of the plastic bulging of a metal diaphragm by