Damage estimation in nonlinear laminates subjected to a transverse concentrated load

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A damage growth problem of nonlinear laminated plates subjected to a transverse concentrated
load is analytically solved to estimate the significance of damage due to low velocity foreign object
impact. The damaged portion is modelled as equally spaced multiply delaminated plates. A
superposition technique is used to derive an approximated relation between the load and deflection.
The first problem is a basic one, that is, a slightly nonlinear response of an intact global plate without
damage pushed by a concentrated load at its center. The second problem is that of a nonlinear response
of piled circular plates with the average radius and the thickness of the delaminated ligaments loaded
by an equivalent force to the reduced bending stiffness due to the introduction of the damage. The
periphery of the delaminated plate is assumed fixed, considering that the bending stiffness of the intact
portion is much higher than the delaminated portion. Some nonlinear effect of the first problem is
considered by introducing initial inplane stress caused by an equivalent relative displacement of the
damaged portion of the first problem. The results are compared with finite element solutions and
showed excellent agreement.
Original languageEnglish
Number of pages10
Publication statusPublished - 24 Jul 2015
EventICCM20 - Bella Center, Copenhagen, Denmark
Duration: 19 Jul 201524 Jul 2015




  • Impact Damage
  • Composite laminate
  • Energy Release Rate


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