![]() ![]() ![]() The post-processing showed that CAD modification was needed. The resulting effect of this could cause plastic deformation and even snapping of the component. The initial simulation found significant stress on the PVC, particularly in 2 distinct pain points where the stresses were found to be greater than the yield (55MPa). Stress and strain analysis of headphones showing the main pain points Finite Element Analysis: Plastic Deformations and Geometry Modification Need some meshing tips? Check out this blog post! This can be calculated by using the impact velocity (5.775 m/s) and the modeled gap distance (which is set to 18 mm for this simulation). Time steps should be small enough to capture full detail of the impact and capture the peak stresses. Once the impact velocity is established, the time step is the next important factor that must be considered. ![]() The headphones are dropped from 1.7 m, and by using the equation displayed above we can calculate the impact velocity of 5.775 m/s. Simulation Setup: Conditions and Modelling Impact velocity equation where A=acceleration (9.81m/s^2) and X=distance (1.7 m) In this project, the impact of a human skull with and without a helmet was simulated with nonlinear dynamic analysis. The purpose of a helmet is to protect the person who wears it from a head injury during impact. This impact analysis aims to answer one important question: Will the PVC (Poly Vinyl Carbonate) component break or deform? Headphone CAD including the materials and PVC yield strength of 55 MPa After assessing the stresses, a geometry change is made and the simulation is run once again to determine how to mitigate design faults in the form of breakage. The cloud-based FEA project evaluates the dynamic impact of stress and deformation exerted on a pair of headphones dropped from a height of 1.7 m via a drop test. Case Study: Dynamic Impact Analysis of Headphones In the following simulation project, the true stress is evaluated. Engineering stress does not take the change into account, and only takes the original cross-sectional area of the structure. To calculate true stress, you take into consideration the change in the cross-sectional area due to elongation forces. To further define stress, one should consider true stress and engineering stress as two separate, but similar, metrics. One of the main goals of structural analysis is to determine the stress exerted onto the structure in question. What Is Engineering Stress and True Stress? To learn more about natural frequency analysis, check out this blog that uses FEA and CFD collaboratively to analyze structural integrity. Lastly, frequency analysis uses FEA software to find the different natural frequencies of a structure. Dynamic impact analysis of headphones Frequency Analysis The article’s featured case study will use this analysis type to evaluate the structural integrity of headphones. Structural analysis of a car wheel under static load Dynamic AnalysisĪs opposed to static analysis, dynamic analysis looks at transient loading including forces that change over time, also taking into account inertia. Static Structural AnalysisĪ static analysis considers static load, or steady-state loading, generally used for determining stresses and strains caused by forces that do not create notable inertia or damping effects. Nonlinearities consist of the plasticity of the material, meaning they account for large deformations, separating contacting, and plastic hyperelastic creep. In both static and dynamic analysis types nonlinearities can be included. The average impact force calculated here is the average over distance, which can be presumed to be proportional to, but not the same as, the average over time.Design Optimization FEA Simulation Finite Element Analysis Stress and Strain Structural Analysis TypesĪt SimScale, we chiefly perform 3 types of structural analysis, including static, dynamic, and frequency. Note that the above calculation of impact force is accurate only if the height h includes the stopping distance, since the process of penetration is further decreasing its gravitational potential energy. If in addition, we know that the distance traveled after impact isĭ = m, then the impact force may be calculated using the work-energy principle to be The kinetic energy just before impact is equal to its gravitational potential energy at the height from which it was dropped:īut this alone does not permit us to calculate the force of impact! H = m, then the velocity just before impact is ![]() If an object of mass m= kg is dropped from height Energy of falling object Impact Force from Falling ObjectEven though the application of conservation of energy to a falling object allows us to predict its impact velocity and kinetic energy, we cannot predict its impact force without knowing how far it travels after impact. ![]()
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