抄録
In this papers a tensile strength tester of portable type with autographycal recording apparatus for stress-strain diagram of the textile materials, single fibers, yarns and clothes, is described.
This tester is constructed with following five units.
1) Clamps holding the test piece
2) Loading mechanism
3) Recording mechanism
4) Pressure regulator equipment
5) Air compressor
On this tester the load is measured by the deflexion of a leaf spring which is connected to the test piece, and the deflexion is detected by the principle of the air micrometer.
As the deflexion of the leaf spring is very small, the elongation of the test piece is equal to the distance of the pull at one end of it. The stress-strain diagram of the test piece is recorded on a piece of paper by the air micrometer mechanism and the pulling mechanism.
If it is necessary to be changed the sensitivility of measuring lord, it can be adjusted by changing the leaf spring or by changing the distance between two supporting points of the spring.
