Stress Relaxation Behavior of Unidirectional Carbon/Epoxy Composites at Elevated Temperature and Analysis Using Viscoplasticity Model

Kawai, Masamichi; Kazama, Takeshi; Masuko, Yoichi; Tsuda, Hiroshi; Takahashi, Jun; Kemmochi, Kiyoshi

doi:10.1299/jsmea.47.8

Cited by 11 publications

(9 citation statements)

References 14 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…The load relaxation tests carry the advantage of revealing a multitude of strain rates compared to a single strain rate in a steady creep test [ 12 ]. The stress relaxation tests play a major role in revealing the composite materials’ viscoelastic/viscoplastic behaviors [ 40 , 41 , 42 , 43 , 44 , 45 ]. Stress relaxation tests provide the rate of decrease in stress for any state of stress that results from maintaining a constant strain during uniaxial loading.…”

Section: Materials and Experimental Methodsmentioning

confidence: 99%

Effect of Nano-Reinforcement Topologies on the Viscoelastic Performance of Carbon Nanotube/Carbon Fiber Hybrid Composites

et al. 2020

View full text Add to dashboard Cite

In this investigation, multi-walled carbon nanotubes (MWCNTs) were grown over carbon fiber fabrics via a relatively nondestructive synthesis technique. The MWCNTs patches were grown into three different topologies: uniform, fine patterned and coarse patterned. Hybrid carbon fiber-reinforced polymer composites (CFRPs) were fabricated based on the patterned reinforcements. Tensile tests, dynamic mechanical thermal analyses (DMTA) and flexure load relaxation tests were carried out to investigate the effect of the patterned nano-reinforcement on the static, dynamic, glass transition, and viscoelastic performance of the hybrid composites. Results revealed that the hybrid composite based on fine-patterned topology achieved better performance over all other configurations as it exhibited about 19% improvement in both the strength and modulus over the reference composite with no MWCNTs. Additionally, the increase in glass transition for this composite was as high as 13%. The damping parameter (tan δ) was improved by 46%. The stress relaxation results underlined the importance of patterned MWCNTs in minimizing the stress decay at elevated temperatures and loading conditions. Utilizing patterned MWCNTs topology significantly reduced the stress decay percentage at the thermomechanical conditions 60 MPa and 75 °C from 16.7% to 7.8%. These improvements are attributed to both the enhanced adhesion and large interface area by placing MWCNTs and by inducing an interlocking mechanism that allows the interaction of the three constituents in load transfer, crack deflection and hindering undesired viscoelastic deformations under different thermomechanical loadings.

show abstract

Section: Materials and Experimental Methodsmentioning

confidence: 99%

Effect of Nano-Reinforcement Topologies on the Viscoelastic Performance of Carbon Nanotube/Carbon Fiber Hybrid Composites

et al. 2020

View full text Add to dashboard Cite

show abstract

“…Carbon fiber reinforced epoxy resin composites have excellent mechanical properties and are widely used in aerospace, automotive and other fields 48 . The two sets of experimental data 49 of carbon‐epoxy T800H/3631 with initial stress of 300 and 250 MPa are obtained by static tensile tests at 100°C for fiber orientation 10°.…”

Section: Determination Of Variable‐order Function and Model Predictionmentioning

confidence: 99%

“…The best fitting results of the variable‐order fractional Zener model with four VO functions in describing the stress relaxation behavior of carbon‐epoxy in Reference 49.…”

Section: Determination Of Variable‐order Function and Model Predictionmentioning

confidence: 99%

Analysis of the variable‐order fractional viscoelastic modeling with application to polymer materials

Han

Yin

Gao

2023

Polymers for Advanced Techs

View full text Add to dashboard Cite

The variable-order fractional (VOF) operator has been extensively employed to depict complex physical phenomena of viscoelastic materials, during which the reasonable form of the proper variable-order (VO) function will significantly affect the applicability and accuracy of proposed fractional model. To this regard, this work aims to provide a technical guidance for VO function selection in VOF viscoelastic modeling. In this paper, we develop a VOF model based on the classical Zener model, the suitable VO function form and the applicability of VOF model are investigated by means of characterizing the stress relaxation and creep recovery behaviors, in which the monotonicity of VO functions (decreasing or increasing) are discussed in detail.The results demonstrate that the stress relaxation and creep recovery responses have a realistic physical meaning only when the VOF rheological model with a monotonically decreasing VO function. Furthermore, three definitions of VOFD are also considered to determine the optimal VO function form and the reasonability of the proposed model is validated by fitting the experimental data of polymer matric materials. The analysis found that the decreasing exponential VO function exhibits good prospects in describing the time-dependent behaviors, and it was found that the V2 and V3 definition types performed better. The results also show that the proposed model has unique advantage compared to the other existing viscoelastic models.Finally, the proposed VOF model is employed to predict the viscoelastic behavior to test the model's predictive ability.

show abstract

“…fiber reinforced composite materials; see [6][7][8][9][10][11][12][13]. Kawai et al [8] considered a phenomenological thermoviscoplastic model for investigating the stress-strain field in carbon/epoxy composites at high temperatures. Thermoplasticity theories at finite strains are proposed by Green and Naghdi [14], Casey [15] and Miehe [16].…”

mentioning

confidence: 99%

“…, , ) = 0 is the loading surface in stress space. For a detail comparison of the thermoplasticity constitutive relations for strain space(8) and stress space(17), the loading functions ( , , ) and 8( , , ) are chosen in a Mises's form, respectively i. e.…”

mentioning

confidence: 99%

On the Thermoplasticity Constitutive Relations for Isoptopic and Transversely Isotropic Materials

Khaldjigitov¹,

Tjprc²

2019

IJMPERD

View full text Add to dashboard Cite

The widely used engineering construction materials such as fiber and laminated composite materials are usually under the thermomechanical forces and undergoes thermoplastic deformations. These composites may be considered as a transversely isotropic or orthotropic materials. In this paper, the plasticity constitutive relations for isotropic and transversely isotropy materials proposed in [33]are developed taking into account the temperature and written up the strain and stress space thermoplasticity constitutive relations for aforementioned materials. For simplicity, thermoplasticitytheories are restricted to a small deformations. The usefulness and privileges of the strain space thermoplasticity constitutive relations for the formulation the coupled thermomechanical boundary value problems are discussed.It is found that the strain space thermoplasticity constitutive relations are more convenient for numerical solution of the coupled thermoplasticity boundary value problems as compared to stress space theory. INTRODUCTIONDespite the advances made in the theory of plasticity and thermoplasticity for small and large deformations, the construction of adequate constitutive relations for isotropic and anisotropic materials remains relevant.The investigation of the plastic deformations of transversely isotropic materials under the thermomechanical forces is important in analyzing the material structures. It is well known that fiber and laminated composites may be considered as a transversely isotropic or orthotropic materials. In recent years, in conjunction with the development of composite materials, researchers have proposed various types of plasticity theories for fiber reinforced, laminated and other composite materials. Aboudi [1] proposed the thermomechanical continuum theory for the prediction of the average behavior of unidirectional fiber reinforced graphite-aluminum composite under various types of mechanical and thermal changes. It should be noted that the theory of plasticity for orthotropic bodies was first proposed by Hill [2]. For fiber reinforced composites, Dvorak and Bahei-EL-Din [3] proposed the constitutive relation for transversely isotropic materials. Constitutive relations of inelasticity for anisotropic materials based on tensor function representations was considered in Boehler and Sawczuk [4], Murakami and Sawczuk [5] and Pobedria [6]. In the literature, there are many works on the thermoplasticity constitutive relations for isotropic, anisotropic and Impact Factor (JCC): 7.6197 SCOPUS Indexed Journal NAAS Rating: 3.11 Y < S J + $% and S J = % J M M .The notations and ℎ depend on hardening functions L( , ) and N( , ) which are defined from the experimental stress-strain curves constructed at different temperatures. Note that a set of stress-strain curves at different temperatures makes up the deformation surface for temperature dependent materials (Figure 1). The hardening functions L( , ) and N( , ) for strain space and stress space thermoplasticity theories, are obtained by generalizing the...

show abstract

Stress Relaxation Behavior of Unidirectional Carbon/Epoxy Composites at Elevated Temperature and Analysis Using Viscoplasticity Model

Cited by 11 publications

References 14 publications

Effect of Nano-Reinforcement Topologies on the Viscoelastic Performance of Carbon Nanotube/Carbon Fiber Hybrid Composites

Effect of Nano-Reinforcement Topologies on the Viscoelastic Performance of Carbon Nanotube/Carbon Fiber Hybrid Composites

Analysis of the variable‐order fractional viscoelastic modeling with application to polymer materials

On the Thermoplasticity Constitutive Relations for Isoptopic and Transversely Isotropic Materials

Contact Info

Product

Resources

About