EVALUATING DEVICE OF FLEXURAL PROPERTY OF MATERIAL, AND EVALUATION METHOD USING THEREOF

• US 20190316998A1
• Filed: 06/25/2019
• Published: 10/17/2019
• Est. Priority Date: 11/23/2016
• Status: Abandoned Application

• Current Assignee: Samsung Electronics Co. Ltd.
• Original Assignee: Samsung Electronics Co. Ltd.
• Inventors: KONG, Hye Young, KWON, Bok Soon, JUNG, Young Suk
• Application Number:
  US16/451,975
• Publication Number:
  US 20190316998A1
• Time in Patent Office: Days
• CPC Class Codes: G01N 2203/0012 Constant speed test
• CPC Class Codes: G01N 2203/0023 Bending
• CPC Class Codes: G01N 2203/0075 Strain-stress relations or elastic constants
• CPC Class Codes: G01N 2203/0218 Calculations based on experimental data
• CPC Class Codes: G01N 2203/028 One dimensional, e.g. filaments, wires, ropes or cables
• CPC Class Codes: G01N 2203/0282 Two dimensional, e.g. tapes, webs, sheets, strips, disks or membranes
• CPC Class Codes: G01N 2203/0682 Spatial dimension, e.g. length, area, angle
• CPC Class Codes: G01N 3/20 by applying steady bending forces G01N3/26, G01N3/28 take precedence

Abstract

An evaluating device of a flexural property includes a holder, a body disposed on the holder and capable of being moved along with a length of direction of the holder, a clamp coupled to the body to be rotated on the body and fixing a first side of the specimen to be evaluated, and a pressing part disposed over the clamp and pressing a second side of the specimen opposite to the first side and disposed upper than the first side of the specimen to bend the specimen, and an evaluation method of a flexural property of the bent specimen using the same.

Claims

1. A method of evaluating flexural property of a bent specimen using a device for evaluating flexural property comprising:

a holder,

a body disposed on the holder and capable of being moved along with a length direction of the holder,

a clamp coupled to the body and capable of being rotated on the body and fixing a first side of a specimen to be evaluated, and

a pressing part disposed on the clamp and pressing a second side of the specimen opposite to the first side and disposed upper than the first side of the specimen to bend the specimen,

the method comprising;

evaluating at least one of a strain L of the bent specimen, a folding stress σ

_f applied to the bent specimen, a folding modulus Mf applied to the bent specimen, by using;

a thickness h of the bent specimen,

a length L″

of a first arc connecting a first point and a second point which are different from each other and applied with a principal stress corresponding to a half of a maximum principal stress applied to the bent specimen,

a length L′

of a first straight line connecting a shortest distance between the first point and the second point,

a curvature radius p of a virtual circle when the first arc is extended to set the virtual circle, and

a bending angle θ

between the clamp and the lower surface of the pressing part.

2. The method of claim 1, wherein the length L″

is represented by Equation 1;

3. The method of claim 1, wherein the length L′

is represented by Equation 2;

4. The method of claim 1, wherein the strain L is a parameter depending on only the bending angle θ

.

5. The method of claim 1, wherein the strain L is represented by Equation 3:

6. The method of claim 1, wherein the folding stress ρ

_f is represented by Equation 4;

7. The method of claim 6, wherein the parameter y′

is represented by Equation 5;

8. The method of claim 6, wherein the length d′

is represented by Equation 6;

9. The method of claim 1, wherein the folding modulus M_f is a parameter depending on the thickness h, the curvature radius ρ

, and the bending angle θ

.

10. The method of claim 1, wherein the folding modulus M_f is represented by Equation 7:

11. The method of claim 1, wherein the bending angle θ

is greater than 0 degree and equal to or less than 180 degrees.