Thin film specimen for tensile test and physical property evaluation method for thin film specimen
AssigneeLG Energy Solution, Ltd.
InventorsHan Sol LEE, Jee Soon CHOI, Yong Seok CHOI
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Abstract
The present invention relates to a method for evaluating physical properties of a thin film specimen and a thin film specimen for a tensile test of the present invention, and according to the present invention, reliability of measured physical properties can be increased, and an abnormal damage of a thin film specimen can be suppressed by analyzing the strain rate of a speckle pattern formed on the thin film specimen by using a digital image correlation analysis scheme during a tensile test of the thin film specimen.
Claims15
A method for evaluating physical properties of a thin film specimen, comprising:
- measuring a tensile strength of a thin film specimen by applying tensile force in directions opposite to each other in a state that a grip portion of the thin film specimen having a speckle pattern is fixed;
- and
- analyzing a strain rate of the speckle pattern while applying tensile force to the thin film specimen,
- wherein, in the thin film specimen on which the speckle pattern is formed, a length ratio (a:b) of a width (a) of a parallel portion to a width (b) of the grip portion is in a range of 1:2 to 6, and a length ratio (c:d) of a gauge length (c) of the thin film specimen to a total length (d) of the thin film specimen is in a range of 1:4 to 7.
A thin film specimen for a tensile test, wherein a length ratio (a:b) of a width (a) of a parallel portion to a width (b) of a grip portion is in a range of 1:2 to 6, and a width of a parallel portion of the thin film specimen is in a range of 8 to 12 mm on average,
- wherein a length ratio (c:d) of a gauge length (c) to a total length (d) of the thin film specimen is in a range of 1:4 to 7, and the gauge length of the thin film specimen is in a range of 50 to 70 mm on average, and
- a surface of the thin film specimen comprises a speckle pattern.
Dependencies are inferred from the claim text.