JPH01124534U

JPH01124534U -

Info

Publication number: JPH01124534U
Application number: JP1820688U
Authority: JP
Priority date: 1988-02-15
Filing date: 1988-02-15
Publication date: 1989-08-24

Description

[Brief explanation of the drawing]

第１図〜第４図は本考案の基本例を示す図で、
第１図は本案のゲージの使用状態を示す平面図、
第２図は第１図の一部を拡大して示した第１基本
例を示す図、第３図は第２図に示す第１基本例に
ついての実際の使用例を示す図、第４図は第２基
本例を示す平面図である。第５図は本考案の具体
的な実施例を示す平面図である。第６図は基本例
についてのスリツト開口量の測定例を示す図、第
７図は同じく亀裂開口量の測定例を示す図、第８
図は同じく応力拡大係数の推定精度を示す図であ
る。第９図および第１０図は従来例による応力拡
大係数を求める手段を示す図で、第９図は簡易モ
デルを用いて求める手段を示す図、第１０図は有
限要素法を用いて求める手段を示す図である。１１……亀裂入り部材、１２……亀裂、１３，
３３，４３……測定ゲージ、１３ａ，３３ａ，４
３ａ……薄板状ベース、１３ｂ，３３ｂ，４３ｂ
……導電線、１４ａ，１４ｂ……測定用リード線
、１５……非接着範囲。 Figures 1 to 4 are diagrams showing basic examples of the present invention.
Figure 1 is a plan view showing how the proposed gauge is used;
Figure 2 is an enlarged view of a part of Figure 1 showing the first basic example, Figure 3 is a diagram showing an actual usage example of the first basic example shown in Figure 2, and Figure 4 is a diagram showing an actual usage example of the first basic example shown in Figure 2. FIG. 2 is a plan view showing a second basic example. FIG. 5 is a plan view showing a specific embodiment of the present invention. Fig. 6 is a diagram showing an example of measuring the slit opening amount for the basic example, Fig. 7 is a diagram showing an example of measuring the crack opening amount, and Fig. 8 is a diagram showing an example of measuring the crack opening amount.
The figure also shows the estimation accuracy of the stress intensity factor. Figures 9 and 10 are diagrams showing means for determining the stress intensity factor according to the conventional example. Figure 9 is a diagram showing a means for determining it using a simple model, and Figure 10 is a diagram showing a means for determining it using the finite element method. FIG. 11...Cracked member, 12...Crack, 13,
33, 43...Measuring gauge, 13a, 33a, 4
3a... Thin plate base, 13b, 33b, 43b
... Conductive wire, 14a, 14b ... Lead wire for measurement, 15 ... Non-adhesive range.

Claims

[Scope of utility model registration request]

A plurality of conductive wires are arranged at known intervals on a thin plate base having electrical insulation properties so as to form independent circuits, and the length of each conductive wire is determined from the crack tip of the crack to be measured. A crack opening displacement measurement gauge characterized in that the gauge is gradually changed so that the gauge corresponding to the crack opening is longer than the gauge corresponding to the crack opening.