Predefined couplings allow for mixing beams with other element types to study reinforcements for solid and shell structures. Formulations for both slender beams (Euler–Bernoulli theory) and thick beams (Timoshenko theory) are available. There are specialized element types for modeling beams, described by their cross section properties. You can include your own material model by providing external functions coded in the C programming language. Material properties can be isotropic, orthotropic, or fully anisotropic. The material models can accommodate thermal expansion, hygroscopic swelling, initial stresses and strains, as well as several types of damping. You can, for example, add custom differential equations to provide inelastic strain contributions. In frequency-domain analyses, you can enter complex-valued expressions. Enter expressions that depend on stress, strain, spatial coordinates, time, or fields coming from another physics interface directly in the input field for a material property. In addition, there are many possibilities to extend the existing material models or create your own. The Structural Mechanics Module provides linear elastic, viscoelastic, and piezoelectric material models, but you can also access a wide range of nonlinear material models, including hyperelastic and elastoplastic, by adding the Nonlinear Structural Materials Module or Geomechanics Module. The interface is multiphysics enabled and can be seamlessly coupled to fluid domains. The interface uses a higher-order dG-FEM time explicit method. The Elastic Waves, Time Explicit interface is dedicated to transient linear elastic waves propagation problems over large domains containing many wavelengths. Absorbing boundary conditions and perfectly matched layers (PMLs) enable efficient modeling of unbounded domains. Mechanical port conditions can be used to excite and absorb propagating modes in waveguide structures and to compute a scattering matrix of a component. The Solid Mechanics interface uses a full structural dynamics formulation that accounts for the effects of shear waves and pressure waves in solids and analyzes elastic waves. Application areas range from micromechanical problems to seismic wave propagation. Model the propagation of elastic waves in isotropic, orthotropic, anisotropic, and piezoelectric solids, for single-physics or multiphysics applications, such as vibration control, nondestructive testing (NDT), or mechanical feedback. Combining with other modules from the COMSOL product suite allows for advanced heat transfer, fluid flow, acoustic, and electromagnetics effects further extend your modeling to include specialized materials modeling and CAD import functionality. The Structural Mechanics Module brings built-in multiphysics couplings that include thermal stress, fluid–structure interaction, and piezoelectricity. Application areas include mechanical engineering, civil engineering, geomechanics, biomechanics, and MEMS devices. The module provides you with modeling tools and functionality for solid mechanics, dynamics and vibrations, materials modeling, shells, beams, contact, fractures, and more. The Structural Mechanics Module, an add-on to the COMSOL Multiphysics ® platform, is an FEA software package tailored for analyzing mechanical behavior of solid structures. Run Mechanical Analyses with Extensive Multiphysics Capabilities
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