Interf rom tre laser de contr le des syst mes optiques

Lamare, Michel; Simon, Jacques

doi:10.1088/0029-4780/2/6/302

Cited by 1 publication

(3 citation statements)

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“…This section summarizes the construction of elastic-damage and elastic-plastic damage models and computational method for predicting failure initiation and propagation [30,31] in the joined specimens. The models consider the joined material, either CVD-SiC or steel, together with a thin joint region consisting of either Ti 3 SiC 2 +SiC of varying modulus and strength or an epoxy.…”

Section: Approachmentioning

confidence: 99%

“…The epoxy-bonded steel specimens simulate samples made and tested at POLITO to help validate the miniature torsion specimen [21,24]. The models are constructed by considering damage in elastic and in elastic-plastic damageable materials that can be described by a scalar damage variable, D, and can be related to the microcrack density or microcrack volume fraction, or simply a parameter that governs the reduction of the elastic stiffness to phenomenologically quantify the level of damage accumulation in the material [31]. In this paper these damage models will be used phenomenologically to simulate fracture in THGs depending on the given material parameters.…”

Section: Approachmentioning

confidence: 99%

“…Damage affects the material stiffness according to a stiffness reduction law: (4) Using the concepts of thermodynamics of continuous media [31,32]…”

Section: Elastic Damage Modelmentioning

confidence: 99%

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Modeling and testing miniature torsion specimens for SiC joining development studies for fusion

Henager

Nguyen

Kurtz

et al. 2015

Journal of Nuclear Materials

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The international fusion community has designed a miniature torsion specimen for neutron irradiation studies of joined SiC and SiC/SiC composite materials. Miniature torsion joints based on this specimen design were fabricated using displacement reactions between Si and TiC to produce Ti 3 SiC 2 + SiC joints with SiC and tested in torsion-shear prior to and after neutron irradiation. However, many miniature torsion specimens fail out-of-plane within the SiC specimen body, which makes it problematic to assign a shear strength value to the joints and makes it difficult to compare unirradiated and irradiated strengths to determine irradiation effects. Finite element elastic damage and elastic-plastic damage models of miniature torsion joints are developed that indicate shear fracture is more likely to occur within the body of the joined sample and cause out-of-plane failures for miniature torsion specimens when a certain modulus and strength ratio between the joint material and the joined material exists. The model results are compared and discussed with regard to unirradiated and irradiated test data for a variety of joint materials. The unirradiated data includes Ti 3 SiC 2 + SiC/CVD-SiC joints with tailored joint moduli, and includes steel/epoxy and CVD-SiC/epoxy joints. The implications for joint data based on this sample design are discussed.

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Section: Approachmentioning

confidence: 99%