Analysis of Industrial Safety Helmet Under Low-Velocity Impact

  • Mahadevan LakshmananEmail author
  • D. P. Prathamesh
Technical Article---Peer-Reviewed


The study focuses on developing a computational model on low-velocity impact which includes the study of different composite materials, and the materials selected include thermosets such as carbon–epoxy, glass–epoxy and thermoplastic such as Twintex material. The above materials were selected because of their high impact resistance properties as well as energy absorption capacity. Furthermore, the damage tolerance of these materials is higher when compared to the polycarbonate material which is presently used. The analysis was carried out using ABAQUS–CAE software where the study was extended to two different types of impact, i.e., linear and oblique, with their damage evolution and analytical validation. The study further focuses on energy absorption capacity, depth of penetration and strain energy absorption by the material under linear and oblique impacts. The analysis revealed the fact that the material Twintex is superior to carbon–epoxy and glass–epoxy with regard to the stress developed. The analysis was carried out by incorporating the Hashin damage criteria also. It was observed that the Twintex material offered more resistance to the depth of penetration in both types of impact. The computational results were compared with analytical results, and they were found to be very close with a minimum deviation.


Low-velocity impact Hashin damage ABAQUS Linear and oblique impact 

List of Symbols


Tensile strength for longitudinal


Compression strength for longitudinal


Tensile strength for transverse


Compression strength for transverse


Shear strength for longitudinal


Shear strength for transverse



σ11, σ22, τ12

Stress tensor for effective components

df, dm and ds

Damage internal variables


Stiffness of impactor and shell


Damping coefficient of impactor and shell


Old position xi and velocities


Forces calculated between 1 and 2


Forces calculated between 2 and 3





M1 and M2

Mass of impactor and helmet + harness


Radius of impactor






Contact energy


Bending-shear energy


Membrane energy


Contact stiffness parameter


Acceleration due to gravity



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Copyright information

© ASM International 2019

Authors and Affiliations

  1. 1.Department of Mechanical Engineering, Amrita School of EngineeringAmrita Vishwa VidyapeethamCoimbatoreIndia

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