Boots – shoes – and leggings
Patent
1982-08-03
1985-09-10
Wise, Edward J.
Boots, shoes, and leggings
73808, 374 47, 364550, G01M 700
Patent
active
045410593
DESCRIPTION:
BRIEF SUMMARY
TECHNICAL FIELD
This invention relates to a stress distribution measuring instrument for measuring a stress distribution of a welded structure, a machine component, etc.
BACKGROUND ART
In order to design and fabricate a welded structure, a machine component, etc. with a good balance of strength and weight in the structure, it is generally useful to know the stress distribution of these objects when a force is applied thereto.
Conventional stress distribution measuring instruments employing a photo-elastic method and employing a stress coating method are heretofore known. However, all of these instruments have disadvantages in that a thin uniform membrane of several hundred microns should be attached to the surface of the object to be measured, and therefore have difficulties in measuring the stress distribution of a large-sized structure. This is true particularly in the stress coating method, since measurement in such a method utilizes the brittleness of an organic substance and controlling the dry condition of the membrane attached to the object to be measured is very difficult. Further, the membrane itself has an unfavorable toxicity.
Thus, conventional stress distribution measuring causes a variety of inconveniences in actual use and is particularly unsuitable for the measurement of the stress distribution of large objects and actual mechanical apparatus, etc.
Accordingly, an object of this invention is to provide a stress distribution measuring instrument in which all of the above-described difficulties accompanying conventional methods have been eliminated, and in which the stress distribution of an object to be measured can be accurately measured without conducting any processing such as attaching any membrane, etc. to the object. Hence, accurate measurement can be performed irrespective of the configuration and the size of the object to be measured.
DISCLOSURE OF THE INVENTION
The invention utilizes the fact that, when an external force, e.g., adiabatic compression or expansion, is applied to a solid, a variation in the quantity of heat occurs in proportion to the amplitude of the strain of the solid as in the case of a gas or liquid. In accordance with this invention, a desired stress distribution is obtained by applying an external force periodically to the solid or object to be measured, using an adaquate scanning means together with an infrared radiation detection means to detect the quantity of irradiated infrared rays for various zones along the two-dimensional plane of the object at the maximum and minimum loading time of the external force, storing the quantities, calculating the difference between the quantities of the infrared radiation at the maximum loading time and at the minimum loading time at every zone with calculating means, and visually displaying the calculated value at the corresponding locations to the respective zones. It is preferred to correct the above calculation in accordance with parameters such as the shape, material, and infrared radiation rate of the object to be measured when carrying out the calculation.
In the stress distribution measuring instrument according to this invention, the distribution of the infrared radiation quantity occuring on the surface of the object to which an adequate external force is applied is detected and analyzed, whereby the stress distribution in the object can be measured without applying any processing to the object. Further, since it is not necessary to conduct any processing on the object at all, measurement of the stress distribution can be effectively and accurately performed regardless of shape and size of the object.
BRIEF DESCRIPTION OF THE DRAWINGS
In the accompanying drawings:
FIG. 1 is a graphical diagram showing the relationship between the quantity of strain and the quantity of infrared radiation;
FIG. 2 is a block diagram showing one preferred embodiment of the stress distribution measuring instrument according to the present invention;
FIG. 3 is a graphical diagram showing the state of the external force applied
REFERENCES:
patent: 4378701 (1983-04-01), Mountain et al.
Cosimano Edward R.
Kabushiki Kaisha Komatsu Seisakusho
Wise Edward J.
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