US2019316998A1PendingUtilityA1
Evaluating device of flexural property of material, and evaluation method using thereof
Assignee: SAMSUNG ELECTRONICS CO LTDPriority: Nov 23, 2016Filed: Jun 25, 2019Published: Oct 17, 2019
Est. expiryNov 23, 2036(~10.3 yrs left)· nominal 20-yr term from priority
G01N 2203/0682G01N 2203/0075G01N 2203/0003G01N 2203/0012G01N 2203/028G01N 3/20G01N 2203/0218G01N 2203/0023G01N 2203/0282G01M 5/0041G01N 3/14G06F 17/10
63
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Claims
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
exact text as granted — not AI-modifiedWhat is claimed is:
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:
L
′′
=
ρ
π
θ
540
.
Equation
1
3 . The method of claim 1 , wherein the length L′ is represented by Equation 2:
L
′
=
2
ρ
sin
θ
6
.
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:
Δ
L
=
(
π
θ
1080
sin
θ
6
-
1
)
×
100.
Equation
3
6 . The method of claim 1 , wherein the folding stress ρ f is represented by Equation 4:
σ
f
=
3
y
′
L
′
F
whd
′2
Equation
4
wherein, in Equation 4, y′ is a parameter considering stress asymmetry of a specimen at each point, F is a force of the pressing part pressing the specimen, w is a length direction width of the specimen, and d′ a length of a second straight line connecting a halfway point of the first straight line with a halfway point of the first arc.
7 . The method of claim 6 , wherein the parameter y′ is represented by Equation 5:
y
′
=
(
10
h
)
2
(
1
-
cos
θ
6
)
ρ
2
(
1
-
cos
30
°
)
.
Equation
5
8 . The method of claim 6 , wherein the length d′ is represented by Equation 6:
d
′
=
ρ
(
1
-
cos
θ
6
)
.
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:
M
f
=
4.8
×
10
4
hF
sin
θ
6
w
ρ
3
(
1
-
cos
θ
6
)
×
(
sin
θ
6
πθ
-
1080
sin
θ
6
)
.
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.Join the waitlist — get patent alerts
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