Measuring and testing – Specimen stress or strain – or testing by stress or strain... – By loading of specimen
Patent
1999-02-16
2000-05-02
Noori, Max
Measuring and testing
Specimen stress or strain, or testing by stress or strain...
By loading of specimen
73786, G01N 300
Patent
active
060558660
DESCRIPTION:
BRIEF SUMMARY
BACKGROUND OF THE INVENTION
The invention proceeds from a method and a device for checking the solidity of vertically anchored masts according to the introductory parts of patent claims 1 and 7.
Such a method and device for this are known from DE-U-94 04 664 and from EP-A-0 638 704. The means comprises a force unit which introduces a force, continuously measured via a force sensor into the mast above its ground anchoring a distance sensor which continuously measures the mast deflection associated with the introduced force, and an evaluation unit to which both reading types are continuously supplied. The force unit introduces a compression or tensile force as a test load into the mast up to a predetermined value, wherein the previously mentioned readings in the evaluation unit are set to a relationship, wherein the force is represented in dependency on the mast deflection. If up to the test load there results a straight line the mast including its anchoring is to be deemed to be in order. If it results that the straight line before achieving the test load blends into a curved line with a decreasing gradient, a plastic deformation of the mast is present with the result that the mast must the exchanged.
The method and the device have been proven in practise since with this in a simple and fast manner it is possible to determine the stability and bending resistance of the mast. The bending resistance of the mast is however also determined in whether the mast in the course of time has obtained fine fractures or cracks which would compromise its working life.
BRIEF SUMMARY OF THE INVENTION
It is the object of the invention to further develop a method and a device of the previously mentioned type such that there may be achieved an indication on the absence of fracture or cracks or the degree of fracturing or cracking of the mast.
In one aspect, this invention provides a solution comprising a method for checking the solidity of vertically anchored masts according to which increasing tensile and compression forces F are introduced into the mast above its anchoring, these being able to be acquired with a force sensor, in order to load the mast with bending moments aligned oppositely to one another, wherein with at least one distance sensor which can be brought to bear against the mast above the mast anchoring, a lateral deflection S of the mast which occurs on amount of the bending moments is measured and wherein the readings for the force F and the deflection S produced by the force and distance sensors are simultaneously or almost simultaneously processed in an evaluation unit with respect to the functions f=F(S) and f-S(F), this being separately according to the courses of the functions f1 for the compression loading case and f2 for the tensile loading case, wherein a deviation of the gradient of the course of the function f1 from the gradient of the course of the function f2 or from the respective references values, which is determined with the elastic deformation of the mast, is evaluated as a criterion for at least one fracture formation in the mast.
In another aspect, this invention provides a solution comprising a device for checking the solidity of vertically anchored masts with a force unit with which increasing tensile and compression forces f acquirable with a force sensor can be introduced into the mast above its anchoring, in order to load the mast with oppositely directed bending moments, and with at least one distance sensor which can be brought to bear against the mast above the mast anchoring for measuring the lateral deflection S of the mast occurring on account of the bending moments, wherein the readings for the force F and the deflection s' produced by the force and distance sensors re simultaneously or almost simultaneously processable in an evaluation unit with respect to the function f-F(S) or f-S(F), this being separately accordingly to the courses of the functions f1 for the compression loading case and f2 for the tensile loading case, wherein a deviation of the gradient of the course
REFERENCES:
patent: 4343179 (1982-08-01), Astrom et al.
patent: 4350044 (1982-09-01), Richardson et al.
patent: 4926691 (1990-05-01), Franklin et al.
patent: 5212654 (1993-05-01), Deuar
Roch Mathias
Roch Oliver
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