# optimization method of composite laminates with a viscoelastic layer

[ref](https://d1wqtxts1xzle7.cloudfront.net/33874260/2011-2-libre.pdf?1401929433=&response-content-disposition=inline%3B+filename%3DMulti_objective_Optimization_of_Co_cured.pdf&Expires=1726671246&Signature=X30Tmzd9RIn7nsIGU2Q4ZgeCchtgP~md5owXYAwnVnZj9pZCx1Ck~6owvGcTyWQwCJcm~i3zbXCXioNqPemkodqkkJ3m3mQZJ5yY7FYpc2i86ZUsACau8A-Gr3YNQ0XNFIGO4drqLGq21zz67T-CnsYfUV3LRpvY4wiZ2TWs4Q~ImvfTtlxcDTCCr4JW5abxR75Fi0yiSe6og7qjwdLh8E50qFdcXTvijO6qm9dnpW854ozStXkGkhsq16PzBfIbFLE7yrXc6zzAtUUHF5YpUfZRYl7V2xfu8s51Cvp9-YIJ8gt2v-qm2uQM92DPbZ9J62unLsIog2pr-HUWUxjqDw__&Key-Pair-Id=APKAJLOHF5GGSLRBV4ZA)

This paper develops a method to transform a multi objective (damping and stiffness)
into a single one, to facilitate optimization.

# experimental investigation of the dissipation of a viscoelastic inserted layer

[ref](https://sci-hub.se/https://journals.sagepub.com/doi/abs/10.1177/1077546319844545)

This paper try to assess the damping qualities of a visco elastic insert. It found that it is very efficient in medium and high frequency ranges.

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# model for impact on fiber metal laminate with a viscoelastic layer

[ref](https://doi.org/10.1016/j.ijmecsci.2021.106298)

_can teach about impact on viscoelastic sandwich impact_

Use a specific criterion to quantitatively estimate whether the composite 
structure is damaged subjected to impact excitation.

Reddy’s high-order shear deformation theory for the viscoelastic layer



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# Hard and Soft Collisions

[ref](https://www.compadre.org/Physlets/mechanics/illustration8_3.cfm)

A soft collision is an inelastic collision, which means that kinetic energy 
is not conserved (because internal friction). However, the momentum is still
conserved.

A perfectly inelastic collision occurs when the two bodies stays together, 
and the energy is lost by bonding the two bodies.

# inelastic collison for composite materials

[ref](https://doi.org/10.1016/0263-8223(90)90025-A)

Use the finite element model to get the dynamic response.

The structure is considered elastic but the loading is considered
inelastic.

The isoparametric linear shell element is modified
to take into account the shear deformation and rotatory inertia.

-

inelastic collision : masses added together and
momentum conserved, used for slamming or other wave-like loading

This model is reasonable when the impactor is relatively soft and the mass 
of impactor is larger than the mass of the node being impacted.

# finite element modeling of low-velocity impact on laminated composite plates and cylindrical shells

[ref](https://doi.org/10.1016/j.compstruct.2010.10.003)

use of abaqus

examination of the validity of different models

propose a  benchmark method in low-velocity impact modeling of composite structures

# Analysis of Laminated Composites Subjected to Impact (p 243)

[ref](https://link.springer.com/chapter/10.1007/978-3-030-66717-7_19)

very recent paper, propose both theoretical and experimental approaches to
the analysis of laminated composite response to impact loading