Saint-Venant Effects in the Iosipescu Specimen

SAGE Publications - Tập 32 Số 22 - Trang 1986-2015 - 1998
Fabrice Pierron1
1Mechanical and Materials Engineering Department, SMS Division, Ecole des Mines de Saint-Etienne, 158, cours Fauriel, 42023 Saint-Etienne Cedex 2, France

Tóm tắt

The main purpose of this paper is to explain the shear strain differences observed between the two faces of certain Iosipescu specimens. The different parasitic moments that can act on the specimen are investigated and their effects assessed. Different Iosipescu fixtures from the literature are checked for these parasitic moments and it is shown that modification of the Wyoming fixture can lead to the elimination of its parasitic in-plane and out-of-plane movements. Finally, it is shown that the strain differences that remain are caused by Saint-Venant effects due to the proximity of the loading points to the notch line but that averaging the strains between the two faces eliminates this effect. This is an important feature since for certain material configurations (thick and transversely stiff specimens), preventing twisting of the fixture is not sufficient to enable the use of only one strain gauge.

Từ khóa


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SAGE Publications

Tập 32 Số 22

1986-2015

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