FEATURES OF EXPERIMENTAL MODEL OBJECTS AND REALIZATION OF EXPERIMENT TO DETERMINE STRESS-STRAIN STATE OF METAL STRUCTURES BASED ON COMPLEX OF INFORMATIVE PARAMETERS
Keywords:
stress-strain state, non-destructive testing, time limit for service, model objects, experimental samples, measuring diagram, experiment methodology, metal structure.Abstract
Provision of reliability, durability, and prognostication of time limit for service and faultless operation of
metal structures in separate elements and units largely depend on the level of stress-strain state, which arises as far
as back as the process of equipment manufacturing and constantly changes during the long-term service. Since the
stress-strain state characterizes a set of internal loadings and deformations of the structure or its elements, which
arise at action of external loadings, temperature fields or other impotent factors, their control is an important constituent
part, which is necessary to take into account when prognosticating the remaining resource. Wrong distribution
of stresses on the structure can lead to an emergency situation.
At present, the main problem for determination of the stress-strain state of the long-term service metal structures
is the low accuracy of the results when determining it since the stress-strain state is calculated on the basis of
the reference data or according to one informative parameter, which does not have complete and sufficient information
about the general structure state. The prime examples of what is not taken into account when calculating and
determining the stress-strain state are such important constituent parts as ageing, fatigue, structural changes arising
during the long-term service, rough conditions, and modes of operation that substantially affect the structure
operability.
This article shows the experimental studies, whose purpose is close reproduction of the process of level change
and determination of the stress-strain state of industrial working objects. The major experiment tasks are to model
and produce study samples, get the complex of informative parameters, according to which it is possible to characterize
and define the stress-strain state of metal structures, determine and analyze the nature of connection between
the dependencies of the measured informative parameters on loading.
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References
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