Mechanical and acoustic performance prediction model for elastomers in different environmental conditions

Area of Science:

• Materials Science
• Acoustics
• Polymer Physics

Background:

• Understanding elastomer behavior under varying environmental conditions is crucial for material design.
• Dynamic mechanical and acoustic properties significantly influence material performance, especially underwater.
• Existing models may not fully capture the complex interplay of temperature, pressure, and frequency on elastomer properties.

Purpose of the Study:

• To develop and validate a constitutive model for predicting dynamic mechanical and acoustic properties of elastomers.
• To investigate the effects of temperature and pressure on elastomer behavior in the frequency domain.
• To establish a relationship between Young's modulus and acoustic properties under different underwater conditions.

Main Methods:

• Utilized the Havriliak-Negami (H-N) model, incorporating experimental Young's modulus data.
• Employed the Williams-Landel-Ferry (WLF) shift function for relaxation time calculations.
• Validated the model by comparing predictions with experimental mechanical and acoustic data at various temperatures and pressures.

Main Results:

• The H-N model accurately describes the dynamic mechanical modulus across a wide frequency range for constant temperature and pressure.
• The proposed model effectively predicts dynamic modulus variations with changing temperature and pressure.
• Established a correlation between Young's modulus and acoustic properties through hydro-wave propagation analysis.

Conclusions:

• The developed constitutive model provides accurate predictions of elastomer mechanical and acoustic properties under diverse environmental conditions.
• The model offers a simplified yet effective approach for predicting material behavior, aiding in material selection and design.
• Parametric studies confirm the model's sensitivity to H-N parameters, enabling fine-tuning for specific elastomer applications.