JPS58158508A - High temperature strain measuring method - Google Patents

Abstract

PURPOSE:To measure strain distribution and local strain accurately, by arrainging a test piece having symmetrical parts in a heating furnace, and measuring one side of the symmetrical parts of the test piece by a Moir e method and the other side by a grid method simultaneously. CONSTITUTION:The test piece 1 has the symmetrical parts 1a and 1b. Heat resisting grids 2 are arranged on the surfaces, respectively. The symmetrical parts 1a and 1b of the test piece 1 are arranged so as to face quartz rods 4a and 4b of the heating furnace 3. The strain of the test piece 1 due to the high temperature is measured by a Moir e strain gage 5 and a grid strain gage 5 through the quartz rods 4a and 4b.

Description

DETAILED DESCRIPTION OF THE INVENTION This invention relates to improvements in methods for measuring strain at high temperatures.

Conventionally, when straining a test piece exposed to high temperatures, a heat-resistant grid (500 pieces per
For this purpose, a change of about 1 nk+) is observed, and methods such as the Morea method, which utilizes the interference fringes of light produced by a heat-resistant grating, and the grating method, in which a part of the heat-resistant grating is directly enlarged and observed, are used.

However, although the Morea method is suitable for measuring the local strain distribution of a test piece, it has problems with accuracy when measuring local strain at the bottom of a notch, etc. On the other hand, the lattice method has a problem in that it is not suitable for measuring local strain at the bottom of a test piece, etc., but it is not suitable for measuring local strain distribution at the bottom of a test piece, etc. Therefore, if strain measurements can be performed simultaneously using the Morea method and the grid method, the strain distribution and local strain can be measured with high accuracy.

Conventionally, there has been no method available for measuring simultaneous strain, which is a problem when measuring creep deformation, which changes over time, by applying the Morea method and the lattice method to the same specimen.

This invention arranges a test piece having a symmetrical part in a heating furnace,
This high-temperature strain measurement method simultaneously measures the high-temperature strain on one side of the symmetrical part of the same test piece using the Morea method, and the high-temperature strain on the other side using the lattice method, making it possible to meet the above requirements.

The present invention will be further explained below with reference to the drawings.

In the figure, 1 is a test piece, which has symmetrical parts J) on the left and right (up and down in Drawing 2) and n and 11).

A heat-resistant grid 2 is disposed on each surface.

This test piece 1 is stored in a heating furnace 3 and heated 11.
A symmetrical portion of the test specimen 1 is placed in front of a pair of quartz rods 411, 41) inserted symmetrically through the wall of the heating furnace 3, respectively.
・], b is positioned.

The quartz rod 4a is used when measuring the strain in one symmetrical part I11 of the test piece I by the morea method, and a morea strain of 5-111iJ D 5 is placed outside the heating furnace 3.

The quartz rod 41] is the other symmetrical part 1b of the test piece 1.
A lattice strain 8'' side mold 6 is disposed outside the heating furnace 3 to measure the strain of the lattice using the lattice method.

As mentioned above, the test piece 1 has a symmetrical part 】a・1h on the left and right and is heated by the heating furnace 3, so the high temperature
The strain of 1゛is equal to the left and right symmetrical parts], a・11).

On the other hand, since the strain is measured through the quartz rods 4a and 41r by the upper layer strain meter auxiliary device 5 and the lattice strain n1 meter 6, it is possible to simultaneously measure the strain at high temperatures.

It goes without saying that the heating furnace 3 -C may be an electric furnace, a high frequency induction furnace, or the like, and that the test piece 1 must be heated uniformly.

[Brief explanation of the drawing]

The drawing is a diagram of an apparatus embodying the method of the invention. 1 Test piece, 1 liter/1b symmetrical part, 2: Heat-resistant grid, 3
°Heating furnace, 4 ++・41]: Quartz rod, 5: Morea strain measuring instrument, 6: Grid strain measuring instrument. Procedural amendment (voluntary) June 1980 // Commissioner of the Japan Patent Office Name of the invention Person making the amendment to the high humidity measurement method Case related to the patent applicant 41 Place Tokyo, F, IFI, Memu- ---
J-1' + 5th Duke] Q Name (620) Mitsubishi Heavy Industries Co., Ltd. Agent Address: 18□1, Marunouchi, Choyoda-ku, Tokyo
No. 5] 13 Mitsubishi Heavy Industries Corporation? Within 1 (m 2) 2T-
, 3111Q Mr. Masaru Name (°"1" Mr. Saka 1 for Fuu (210
, Supplement i [Contents of 11th ward song no mahayasa l kei 1to” Risa 61, The scope of the claims is amended as follows. ``A test piece with a symmetrical part is placed in a heating furnace, and the high-temperature strain in a part of the symmetrical part of the same test piece is measured simultaneously using the Moiré method, and the high-temperature strain on the other side is measured simultaneously using the lattice method. A high-temperature strain measurement method characterized by eye,
And "morea" in lines 5 and 17 of page 4 is corrected to "moire". Above 65-

Claims (1)

[Claims] A test piece having a symmetrical portion is placed in a heating furnace. A high-temperature strain measurement method characterized by simultaneously measuring the high-temperature strain on one side of the symmetrical part of the same test piece using the Morea method and the high-temperature strain on the other side using the lattice method.