Use of plastic models to evaluate thermal strains in diesel-engine pistons
- 1 July 1968
- journal article
- Published by SAGE Publications in Journal of Strain Analysis
- Vol. 3 (3) , 176-186
- https://doi.org/10.1243/03093247v033176
Abstract
The paper presents a low-temperature plastic-model technique for the simulation of thermal strains in diesel-engine pistons. Various difficulties in obtaining accurate thermal-strain measurements from resistance strain gauges attached to plastics are discussed. These difficulties include: the formation of a hot spot under the gauge, caused either by the low-conductivity gauge or by the electrical power dissipated by the grid; the apparent strain characteristics of gauges mounted on plastics; reinforcement of the model by the gauge; irreversible expansion of the plastic causing zero drift. An application of the technique is given, and the service failure of a 19-in diameter piston crown is explained.Keywords
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