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Reference : UMR7649-VALJAM-009
Workplace : PALAISEAU
Date of publication : Thursday, July 25, 2019
Type of Contract : FTC Scientist
Contract Period : 10 months
Expected date of employment : 1 October 2019
Proportion of work : Full time
Remuneration : 2693 to 3105 Euros before taxes/month, depending on the candidate's experience
Desired level of education : PhD
Experience required : 1 to 4 years
The post-doc will participate to the definition of suitable micromechanical tests to determine the hardness, elastic properties, and residual stresses of hard coatings, and the resistance to fracture and wear of nanostructured and coated glass or single crystal Silicon or Germanium substrates, as well as the resistance to bending and buckling of single conical nanostructures due to normal or lateral impacts. He/she will run these tests (with some technical support from the labs technical staff). He/she will also run finite element simulations (on elastically anisotropic materials) for the mechanical optimization of nanostructures design and for a proper analysis of test results. Some of the tests (buckling or bending of single nanostructures) will be performed under an AFM, some in a scanning electron microscope (wear tests), some on a dual-beam SEM (FIB micro-milling associated with high-resolution digital image correlation to measure residual stress relaxation-induced strain fields and deduce the residual stresses), some on a nano-indentor, and some (biaxial bending until fracture) on classical testing machines. He/she will periodically have to make presentations of the work to the other participants in the project.
Biaxial bending tests until fracture, wear tests in a SEM, bending and buckling of nanostructures under an AFM, measurement of residual stresses by DIC during FIB micro-milling, nano-indentation. Fractographic observations with an optical microscope or a SEM. Finite element simulations (elastic anisotropy). Analysis and synthesis of test results. Oral presentations to the partners of the project and maybe in a congress as well as in a paper.
The candidate should necessarily hold a PhD in the field of experimental mechanics of materials. Applications should include a resume highlighting the candidate's training and experience in experimental mechanics and finite element simulations, a publications list, and recommendation letter(s) or e-mail adress of referents
The proposed position is related to project F-Mars (January 2019-2022, funded by DGA) involving Thales TRT, the laboratory "Physique et Mécanique des milieux hétérogènes" at ESPCI and the LMS, aiming at the development of multifunctional optical windows that should be antireflective and superhydrophobic, but should also withstand various mechanical loadings [1-2]. Thales will manufacture nanostructured glass or single crystal Silicon or Germanium substrates, coated with hard DLC or alumina thin films. The aim of the project is to optimize the nanostructure design, as well as the elaboration process of the hard coatings, relative to the functional properties and the mechanical durability. LMS is in charge of the latter aspect. The LMS, associated with the CNRS has 85 members. The post-doc will be part of the Materials group, supervised by V. Doquet and assisted by technicians and engineers for the experiments
Constraints and risks
No particular risk. However, like each newcomer at LMS, the post-doc will be trained to safe manipulation of chemicals and safe mechanical testing
The actual starting date will be flexible: between October 2019 and January 2020
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