A unified interpretation of threshold stresses in the creep and high strain rate superplasticity of metal matrix composites

1999 ◽  
Vol 47 (12) ◽  
pp. 3395-3403 ◽  
Author(s):  
Y Li ◽  
T.G Langdon
Keyword(s):  
High Strain Rate ◽  
Strain Rate ◽  
Metal Matrix Composites ◽  
Metal Matrix ◽  
High Strain ◽  
Matrix Composites

scholarly journals Mechanical Behavior of Titanium Based Metal Matrix Composites Reinforced with TiC or TiB Particles under Quasi-Static and High Strain-Rate Compression

Materials ◽  
2021 ◽  
Vol 14 (22) ◽  
pp. 6837
Author(s):  
Pavlo E. Markovsky ◽  
Jacek Janiszewski ◽  
Oleksandr O. Stasyuk ◽  
Vadim I. Bondarchuk ◽  
Dmytro G. Savvakin ◽  
...  
Keyword(s):  
High Strain Rate ◽  
Strain Rate ◽  
Mechanical Behavior ◽  
Metal Matrix Composites ◽  
Metal Matrix ◽  
High Strain ◽  
Strain Rates ◽  
Matrix Composites ◽  
Strain Rate Compression ◽  
Static Conditions

The mechanical behavior of titanium alloys has been mostly studied in quasi-static conditions when the strain rate does not exceed 10 s−1, while the studies performed in dynamic settings specifically for Ti-based composites are limited. Such data are critical to prevent the “strength margin” approach, which is used to assure the part performance under dynamic conditions in the absence of relevant data. The purpose of this study was to obtain data on the mechanical behavior of Ti-based composites under dynamic condition. The Metal Matrix Composites (MMC) on the base of the alloy Ti-6Al-4V (wt.%) were made using Blended Elemental Powder Metallurgy with different amounts of reinforcing particles: 5, 10, and 20% of TiC or 5, 10% (vol.) of TiB. Composites were studied at high strain rate compression ~1–3·103·s−1 using the split Hopkinson pressure bar. Mechanical behavior was analyzed considering strain rate, phase composition, microstructure, and strain energy (SE). It is shown that for the strain rates up to 1920 s−1, the strength and SE of MMC with 5% TiC are substantially higher compared to particles free alloy. The particles TiC localize the plastic deformation at the micro level, and fracturing occurs mainly by crushing particles and their aggregates. TiB MMCs have a finer grain structure and different mechanical behavior. MMC with 5 and 10% TiB do not break down at strain rates up to almost 3000 s−1; and 10% MMC surpasses other materials in the SE at strain rates exceeding 2200 s−1. The deformation mechanism of MMCs was evaluated.

Numerical simulation of strain rate effect on the inelastic behavior of metal matrix composites

2017 ◽  
Vol 24 (2) ◽  
pp. 279-288
Author(s):  
Qiang Chen ◽  
Zhi Zhai ◽  
Xiaojun Zhu ◽  
Caibin Xu ◽  
Xuefeng Chen
Keyword(s):  
Strain Rate ◽  
Metal Matrix Composites ◽  
Metal Matrix ◽  
Plastic Region ◽  
Micromechanical Model ◽  
Matrix Composites ◽  
Cross Sectional ◽  
Axis Orientation ◽  
Array Pattern ◽  
Sectional Shape

AbstractThe primary goal of this paper is to investigate the combined effects of strain rate and microscopic parameters (fiber off-axis orientation, array pattern and cross-sectional shape) on the mechanical behavior of metal matrix composites (MMCs). To this end, a rate-dependent micromechanical model by the combination of finite-volume theory and Bodner-Partom viscoplastic model is developed to analyze the inelastic response of MMCs. In the simulations, the fibers are modeled as linearly elastic while the metal matrix exhibits viscoplasticity. The macroscopic stress-strain response, local stress and strain fields are obtained simultaneously. An acceptable agreement has been found between the model’s prediction and finite-element results, which demonstrates the good predictive capabilities of the proposed method. It is concluded that the composite response is strongly affected by strain rate, fiber array pattern and cross-sectional shape in the elastic-plastic region but to a lesser extent in the elastic region. Furthermore, the clustering array provides stiffer response than random and square ones; the square fiber predicts stiffer response than circular and elliptical ones. However, increasing the strain rate will weaken the influence of clustering array and square fibers.

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