Dietmar Koch’s research while affiliated with University of Augsburg and other places

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Publications (1)


Preform and lamination of continuous HTA carbon fibers with 2/2 twill woven for the manufacturing of C/C‐SiC
C/C‐SiC material with fiber orientation of 0° & 90°, coordinate system (x and y‐direction) in accordance with the mechanical loading directions and rotated to another coordinate system (1 and 2‐direction) with rotation angle of 45°
Typical stress‐strain behaviors of C/C‐SiC material with fiber orientation of 0° & 90° and +45° & −45° under uniaxial tensile, compression, and pure shear loading
Failure paths (red arrows) of tested C/C‐SiC samples with fiber orientation 0° & 90° (with x–y axis and z‐axis is for thickness direction) and +45° & −45° (with 1–2 axis and 3‐axis is for thickness direction), A) 0° & 90° uniaxial tension; B) and C) 0° & 90° uniaxial compression; D) 0° & 90° Iosipescu‐shear; E) +45° & −45° uniaxial tension; F) and G) +45° & −45° uniaxial compression; H) +45° & −45° Iosipescu‐shear
Stress‐strain curves in x–y axes and their approximations: (A) uniaxial tension and compression and linear approximation based on the tensile modulus; (B) shear stress‐strain curve and its polynomial fit

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Experimental evaluation and theoretical prediction of elastic properties and failure of C/C‐SiC composite
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May 2021

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9 Citations

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Dietmar Koch

The paper presents experimental characterization and theoretical predictions of elastic and failure properties of continuous carbon fiber reinforced silicon carbide (C/C‐SiC) composite fabricated by Liquid Silicon Infiltration (LSI). Its mechanical properties were determined under uniaxial tensile, compression, and pure shear loads in two sets of principal coordinate systems, 0°–90° and ±45°, respectively. The properties measured in the 0°–90° coordinate system were employed as the input data to predict their counterparts in the ±45° coordinate system. Through coordinate transformations of stress and strain tensors, the elastic constants and stress‐strain behaviors were predicted and found to be in good agreement with the experimental results. In the same way, three different failure criteria, maximum stress, Tsai‐Wu, and maximum strain, have been selected for the evaluation of the failure of C/C‐SiC as a type of genuinely orthotropic material. Based on the comparisons with experimental results, supported by necessary practical justifications, the Tsai‐Wu criterion was found to offer a reasonable prediction of the strengths, which can be assisted by the maximum stress criterion to obtain an indicative prediction of the respective failure modes.

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Citations (1)


... The main load is carried by the fiber bundles of the vertical screen, leading to the interface debonding and fiber pullout fracture. [39][40][41] With the increase in bulk density of the C/C preform and the HT, the overall fiber pullout length of the C/C-SiC composites increases, improving the fracture strain of the composite, as shown in Figure 9. ...

Reference:

Effects of density and heat treatment of C/C preforms on microstructure and mechanical properties of C/C–SiC composites
Experimental evaluation and theoretical prediction of elastic properties and failure of C/C‐SiC composite