Application of a hybrid test specimen for designing potting compounds in automotive electric-drive motors

Gundlach, Carsten; Hartwig, Sven; Mannig, M.; Dilger, Klaus; Menzel, M.; Lück, Peter

doi:10.51202/9783181023433-201

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2021

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“…Temperature-dependent cohesive and adhesive strength parameters are identified through tensile, compression, compression shear, and wire pull-out tests. For an evaluation of the resulting stress state, a parabolic failure criterion was chosen [2], and validated by use of specialized hybrid test specimen [3].…”

Section: Methodsmentioning

confidence: 99%

Modeling and Simulation of the Thermo‐Mechanically Induced Fracture Behavior of an Epoxy System in Electric Traction Machines

Böckenhoff

Kästner

2021

Proc Appl Math and Mech

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This papier studies the critical stress state prediction for production-and operation-induced loads on an epoxy-based mold in an electric rotor. The constitutive behavior of the mold is given by a linear thermo-viscoelastic material model with an ARRHENIUS-based time-temperature superposition, which is modified to also account for chemical curing shrinkage. A finite element analysis (FEA) is performed to evaluate two loading states which result in mold failure due to cracking. The results are compared to experimental evidence. The method is found to predict the location of crack initiation, as well as the direction of crack propagation.

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Section: Methodsmentioning

confidence: 99%