A Rate Dependent Constitutive Model for Carbon-Fibre/Epoxy-Matrix Woven Fabrics Submitted to Dynamic Loadings

Abstract Uncured rubber possesses remarkable hyperelastic and viscoelastic properties while it undergoes large deformation; therefore, it has wide application prospects and attracts great research interests from academia and industry. In this paper, a nonlinear constitutive model with two parallel networks is developed to describe the mechanical response of uncured rubber. The constitutive model is incorporated with the Eying model to describe the hysteresis phenomenon and viscous flow criterion, and the hyperelastic properties under large deformation are captured by a non-Gaussian chain molecular network model. Based on the model, the mechanical behaviors of hyperelasticity, viscoelasticity and hysteresis under different strain rates are investigated. Furthermore, the constitutive model is employed to estimate uniaxial tensile, cyclic loading–unloading and multistep tensile relaxation mechanical behaviors of uncured rubber, and the prediction results show good agreement with the test data. The nonlinear mechanical constitutive model provides an efficient method for predicting the mechanical response of uncured rubber materials.

Download Full-text

Strain-rate-dependent constitutive and damage models for a low-yielding-strength steel under dynamic loadings

Journal of Mechanical Science and Technology ◽

10.1007/s12206-021-0911-7 ◽

2021 ◽

Vol 35 (10) ◽

pp. 4405-4417

Author(s):

Peishi Yu ◽

Jin Zhang ◽

Chaofeng Zhang ◽

Junhua Zhao

Keyword(s):

Strain Rate ◽

Damage Models ◽

Rate Dependent ◽

Dynamic Loadings

Download Full-text

Micromechanics prediction of the shear strength of carbon fibre/epoxy matrix composites: the influence of the matrix and interface strengths

Composites ◽

10.1016/0010-4361(92)90027-r ◽

1992 ◽

Vol 23 (6) ◽

pp. 463

Keyword(s):

Shear Strength ◽

Carbon Fibre ◽

Epoxy Matrix ◽

Matrix Composites ◽

The Matrix

Download Full-text

Energy absorption behaviour of different grades of steel sheets using a strain rate dependent constitutive model

Thin-Walled Structures ◽

10.1016/j.tws.2016.11.005 ◽

2017 ◽

Vol 111 ◽

pp. 9-18 ◽

Cited By ~ 2

Author(s):

Pundan K. Singh ◽

Anindya Das ◽

S. Sivaprasad ◽

Pinaki Biswas ◽

Rahul K. Verma ◽

...

Keyword(s):

Constitutive Model ◽

Strain Rate ◽

Energy Absorption ◽

Steel Sheets ◽

Rate Dependent

Download Full-text

Extension of Flow Behaviour and Damage Models for Cast Iron Alloys with Strain Rate Effect

10.21203/rs.3.rs-113055/v1 ◽

2020 ◽

Author(s):

Chuang Liu ◽

Dongzhi Sun ◽

Xianfeng Zhang ◽

Florence Andrieux ◽

Tobias Gerster

Keyword(s):

Cast Iron ◽

Constitutive Model ◽

Strain Rate ◽

Mechanical Behavior ◽

Damage Model ◽

Iron Alloys ◽

Strain Rate Range ◽

Strain Rates ◽

Damage Models ◽

Rate Dependent

Abstract Cast iron alloys with low production cost and quite good mechanical properties are widely used in the automotive industry. To study the mechanical behavior of a typical ductile cast iron (GJS-450) with nodular graphite, uni-axial quasi-static and dynamic tensile tests at strain rates of 10− 4, 1, 10, 100, and 250 s− 1 were carried out. In order to investigate the effects of stress state, specimens with various geometries were used in the experiments. Stress–strain curves and fracture strains of the GJS-450 alloy in the strain-rate range of 10− 4 to 250 s− 1 were obtained. A strain rate-dependent plastic flow law based on the Voce model is proposed to describe the mechanical behavior in the corresponding strain-rate range. The deformation behavior at various strain rates is observed and analyzed through simulations with the proposed strain rate-dependent constitutive model. The available damage model from Bai and Wierzbicki is extended to take the strain rate into account and calibrated based on the analysis of local fracture strains. The validity of the proposed constitutive model including the damage model was verified by the corresponding experimental results. The results show that the strain rate has obviously nonlinear effects on the yield stress and fracture strain of GJS-450 alloys. The predictions with the proposed constitutive model and damage models at various strain rates agree well with the experimental results, which illustrates that the rate-dependent flow rule and damage models can be used to describe the mechanical behavior of cast iron alloys at elevated strain rates.

Download Full-text

CARBON FIBRE ALIGNMENT FOR REINFORCED COMPOSITES USING EMBROIDERY TECHNOLOGY

TEXTEH Proceedings ◽

10.35530/tt.2021.14 ◽

2021 ◽

Vol 2021 ◽

pp. 102-108

Author(s):

J. Domenech-Pastor ◽

P. Diaz-Garcia ◽

D. Garcia

Keyword(s):

Mechanical Properties ◽

Flexural Strength ◽

Carbon Fibre ◽

Carbon Fibers ◽

Vertical Direction ◽

Woven Fabrics ◽

Woven Fabric ◽

Reinforced Composites ◽

Good Opportunity ◽

Fibre Reinforced Composites

Composites are materials formed by the combination of two or more components that acquire better properties than the ones obtained by each component on its own. Composites have been widely used in the industry due to its light weight and good mechanical properties. To improve these properties several layers of reinforced material (e.g., carbon fibre) are overlapped which produce an increase in the fibre consumption. In this sense Tailored Fibre Placement (TFP) embroidery can offer good opportunity to reduce the consumption of reinforced fibre while improving the mechanical properties due to the alignment of the fibres in the effort direction. This study analyzes the performance of carbon fibre reinforced composites with Polyester resin made with TFP embroidery technology against flexural strength efforts and without using plain woven fabrics to demonstrate that the use of reinforcement fabrics in composites can be optimized by a curved alignment of the fibers. Two different structures were embroidered with TFP technology, one simulating a woven fabric with straight unidirectional alignment of fibres in horizontal and vertical direction, and a second structure made with curvilinear alignment of carbon fibers. After the study of the flexural mechanical properties an improvement of 18% was obtained in maximum flexural strength.

Download Full-text