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NDE residual stress
More information about residual stress tester
The residual stress in a metal do not depend on its hardness, but from the module of elasticity or Young module and from its chemical composition (density).
The hardness of a metal indicates its ability to absorb energy elastic, plastic or kinetic energy, but through it not possible to determine the value of residual stress. In a metal with the same hardness we will have a different values of this stress. Therefore, the problem will be to measure the values that vary so exactly proportional to the residual stress values in a given metal.
The residual stresses tend to equilibrate themselves in the surface of the material.
The measurement made with all the major methods, X-ray, string gauge (destructive), optical etc. the residual stress is determined between the measuring the displacement of the equilibrium point the reticule crystalline.
The method discovered analyzes the value of acceleration vibratory generated by an impulse to constant energy with the subsequent reaction elastic (elastic field) from the metal, The equipment does not recognize the value of compression from that of tensile stress. It gives the value of the space resulting or volume but with the applying of a triaxial accelerometer we can have forces values axis x, y, z.
You will realize the convenience of this apparatus.
1) Portable and easy to use and very rapid.
2) NDT non-destructive examination (strain gauges).
3) Repeatable in unlimited number of times.
4) Not dangerous (X-ray).
5) Do not expensive. Effective for weldings, hardened treatments, vessels control, bridges, pipes line, aeronautics, NDT inspection for every metal types.
Ennio Curto
OPEN LETTER TO BIGS EXPERTS RESIDUAL STRESS NDT / NDE
OPEN LETTER TO BIGS EXPERTS RESIDUAL STRESS NDT / NDEI want to open a debate on the issue of residual stress of metallic materials, I'm not meant to be a treatise on the subject as is well known to all experienced the phenomenon. I want to review the major technical innovations concerning the usual and known current systems such as X-ray diffraction method, Ultrasonic Method, the system Barkhausen. Magnetic Non-Destructive Method all except the blind-hole drilling strain gage method (Rosetta) There is nothing new in the sunlight. The number of conferences and meetings and countless other very expensive and among those who argue are always the same great experts, great academics of the subject, but the systems do not change are always the same equipment even more sophisticated but still with the usual drawbacks of practicality and high costs. Basically the world of measurements of residual stresses in metallic materials is a world closed to new discoveries in this field. Prominent case of experimentation mechanical SEM who called himself an independent but which is sponsored by Vishay (rosettes) and whose head of technical section of residual stress does not deign to respond with a letter being logically linked companies in the sector. Not taking account of the journals that apply the same method. It 'still proper and fair that those men who were open to this new system and who deserve my thanks: Kenji J. Krzywosz EPRI-CharlotteSrersonname. Project Manager, NDE Prof. Dr.Ing Berthold Scholtes für Werkstofftechnik - Metallic Werkstoffe Universität Kassel Y. Kudryavtsev, J. Kleiman Integrity Testing Laboratory Inc. dot. Mike Steinzig Los Alamos National Laboratory lanl.gov For the attention and keen interest paid to this innovative system for measuring residual stress NDT / NDE. I would then have a confrontation over the Internet with one of them will want it also because the costs of related conferences not allow me to meet them easily. Sincerely Ennio Curto. Text automatically translated from Italian into English by Google