Definition of the linearity loss of the surface temperature in static tensile tests
Static tensile tests on material for mechanical constructions have pointed out the linearity loss of the surface temperature with the application of load. This phenomenon is due to the heat generation caused by the local microplasticizations which carry the material to deviate from its completely...
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| Main Authors: | , , |
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| Format: | Article |
| Language: | English |
| Published: |
Gruppo Italiano Frattura
2014-10-01
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| Series: | Fracture and Structural Integrity |
| Subjects: | |
| Online Access: | http://www.gruppofrattura.it/pdf/rivista/numero30/numero_30_art_26.pdf |
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| Summary: | Static tensile tests on material for mechanical constructions have pointed out the linearity loss of
the surface temperature with the application of load. This phenomenon is due to the heat generation caused by
the local microplasticizations which carry the material to deviate from its completely thermoelastic behavior,.
The identification of the static load which determines the loss of linearity of the temperature under stress,
becomes extremely important to define a first dynamic characterization of the material.
The temperature variations that can be recorded during the static test are often very limited (a few tenths of
degree for every 100 MPa in steels) and they require the use of special sensors able to measure very low
temperature variations. The experience acquired in such analysis highlighted that, dealing with highly accurate
sensors or with particular materials, the identification of the first linearity loss (often by eye) in the temperature
curves, can be influenced by the sensibility of the investigator himself and can lead to incorrect estimates. The
aim of this work is to validate the above mentioned observations on different steels, by applying the
autocorrelation function to the data collected during the application of a static load. This, in order to make the
results of the thermal analysis free from the sensitivity of the operator and to make the results as objective as
possible, for defining the closest time of the linearity loss in the temperature-time function. |
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| ISSN: | 1971-8993 1971-8993 |