Memorias de investigación
Communications at congresses:
Numerical Modelling of Stress Fields and Residual Constraints in Metallic Targets Subject to Laser Shock Processing

Research Areas
  • Mechanical engineering,
  • Naval engineering,
  • Construction materials

Although significant experimental work has been performed in order to explore the optimum conditions for application of Laser Shock Processing (LSP) treatments and to assess their capability to provide enhanced mechanical properties, only limited attempts have been developed in the way of predictive assessment of the characteristic physical processes and transformations with a specific consideration of real material properties and associate laser interaction dynamics. From the point of view of the thermomechanical behaviour of the target material, most of the simplified models used for the analysis of its residual shocked state rely on rather simple estimations or material response equations that rarely take into account a detailed description of the material subject to a simultaneous dynamic compression and either deformation-induced or plasma-driven thermal heating. From the point of view of a correct analysis of the stress-strain and heating behaviour of LSP targets, the important fact is that the material is stressed and deformed in a dynamic way, with strain rates exceeding 106 s-1, a condition under which static stress-strain curves are essentially invalid to characterize the material response. The calculational system developed by the authors (SHOCKLAS) includes a coupled analysis of the pressure wave applied to the target material as a result of the plasma buildup following laser interaction and the shock wave propagation into the solid material with specific consideration of the material response to thermal and mechanical alterations induced by the propagating wave itself (i.e. effects as elastic-plastic deformation, changes in elastic constants, etc.). The model is applicable to the typical behaviour shown by the different materials through their dynamic strain-stress relations. In the present paper, the key features and several typical results of the developed SHOCKLAS calculational system are presented. In particular, the application of the model to the realistic simulation (full 3D dependence, non linear material behaviour, thermal and mechanical effects, treatment over extended surfaces) of LSP treatments in the experimental conditions of the irradiation facility used by the authors is presented. The observed convergence between the numerical results provided by the developed calculational system and the experimental results obtained by the authors group in the measurement of residual stresses fields of test specimens after irradiation system assures the validation of the model and provides a true predictive assessment capability aiming to favour LSP industrial implementation.
First International Conference on Laser Peening
Johnson Space Center NASA, Houston, Texas (EE.UU.)
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Research Group, Departaments and Institutes related
  • Creador: Grupo de Investigación: Ingeniería y Aplicaciones del Láser
  • Centro o Instituto I+D+i: Centro Laser
  • Departamento: Física Aplicada a la Ingeniería Industrial
  • Departamento: Automática, Ingeniería Electrónica e Informática Industrial
  • Grupo de Investigación: Ciencias de la Computación en la Educación y en la Representación del Conocimiento