A General Temperature-Dependent Stress-Strain Constitutive Model for Polymer-Bonded Composite Materials

Area of Science:

• Materials Science
• Mechanical Engineering
• Composite Materials

Background:

• Polymer-bonded composites exhibit complex mechanical behavior influenced by temperature.
• Accurate constitutive models are crucial for predicting deformation under various conditions.
• Existing models may lack temperature dependency or possess excessive parameters.

Purpose of the Study:

• To develop a general, temperature-dependent stress-strain constitutive model for polymer-bonded composites.
• To enable accurate prediction of material deformation under tension and compression across a wide temperature range.
• To create a model with fewer parameters and improved accuracy compared to existing models.

Main Methods:

• Laboratory testing of material specimens under uniaxial tension and compression at temperatures from -40°C to 75°C.
• Utilizing the Ramberg-Osgood relationship to establish a single-temperature stress-strain constitutive model.
• Developing a temperature-dependent model by correlating parameters with temperature using a response surface.
• Implementing the model as a user material routine in a finite element package.

Main Results:

• The stress-strain response was characterized by distinct elastic and plastic regimes.
• A novel temperature-dependent constitutive model was successfully established.
• Validation using independent and third-party data confirmed the model's effectiveness and accuracy.
• The proposed model demonstrated superior performance with fewer parameters and reduced relative errors compared to a reference model.

Conclusions:

• The developed temperature-dependent constitutive model accurately predicts the deformation behavior of polymer-bonded composites.
• The model offers a more efficient and accurate alternative to existing methods for engineering applications.
• Successful implementation in finite element analysis verifies its practical utility in structural simulations.