ISO 16842:2021 金属材料—シートとストリップ—十字形の試験片を使用した二軸引張試験法 | ページ 6

3.1

cruciform test piece

test piece which is recommended in the biaxial tensile test and whose geometry is specified in this document

Note 1 to entry: See Figure 1.

3.2

gauge area

square area which is located in the middle of the cruciform test piece and is enclosed by the four arms of the cruciform test piece

Note 1 to entry: See Figure 1.

3.3

arm

generic name for all areas other than the gauge area in the cruciform test piece

Note 1 to entry: The arms play a role of transmitting tensile forces in two orthogonal directions to the gauge area of the cruciform test piece (see Figure 1).

3.4

biaxial tensile testing machine

testing machine for applying biaxial tensile forces to a cruciform test piece in the orthogonal directions parallel to the arms of the test piece

Note 1 to entry: See Annex C.

3.5

yield surface

group of stress determined in a stress space, at which a metal starts plastic deformation when probing from the elastic region into the plastic range

Note 1 to entry: See Annex A and Reference [1].

3.6

yield function

mathematical function used to generate the conditional equation (yield criterion) to which the stress components ought to conform when the material subject to the stress is in the plastic deformation state

Note 1 to entry: See Annex A.

3.7

contour of plastic work

graphic figure derived by subjecting the material to plastic deformation along various linear stress paths and plotting the stress points in stress space at the instance when the plastic work consumed per unit volume along each stress path becomes identical and the plotted stress points are approximated into either a smooth curve or curved surface

Note 1 to entry: See Annex A.