Relation of energy absorption of composite structures to material strength

Wolff, Ch.; Bastid, Philippe; Bunsell, Anthony R.

doi:10.1016/0961-9526(94)90027-2

Cited by 3 publications

(2 citation statements)

References 11 publications

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“…However, they actually perform much better when a comparison is made in terms of the specific energy absorption, which is the energy per unit mass (Lu and Yu 2003). The specific energy absorption of fiber is affected by fiber strength, elastic properties, the diameter-to-thickness ratio of FRP, fiber orientation, and sectional geometries (Wolff et al 1994). These studies confirm that directly using the balanced-energy method (proposed for steel confined concrete) for FRP-confined concrete is inappropriate.…”

Section: Strain Energy and Energy Absorptionmentioning

confidence: 99%

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Strain Estimation of CFRP-Confined Concrete Columns Using Energy Approach

Pham

Hadi

2013

J. Compos. Constr.

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A new model is presented for calculating the axial strain of carbon fiber-reinforced polymer (CFRP)-confined concrete columns. An energy-balance approach is introduced to establish a relationship of the energy absorption between a confined concrete column and CFRP. The proposed model was verified using a large database collected from 167 CFRP-confined plain concrete specimens. This database contains 98 circular specimens with diameters ranging between 100 and 152 mm, and 69 square specimens having a side length ranging between 100 and 152 mm. The database covers unconfined concrete strengths from 20 to 50 MPa. The proposed model shows very good correlation with the experimental results. In addition, the proposed model also provides a comparative prediction of the strain of CFRP-confined concrete columns in two extreme cases, i.e., (1) insufficient confinement, and (2) heavy confinement, which are not usually well predicted by other models. Abstract: A new model is presented for calculating the axial strain of carbon fiber-reinforced polymer (CFRP)-confined concrete columns. An energy-balance approach is introduced to establish a relationship of the energy absorption between a confined concrete column and CFRP. The proposed model was verified using a large database collected from 167 CFRP-confined plain concrete specimens. This database contains 98 circular specimens with diameters ranging between 100 and 152 mm, and 69 square specimens having a side length ranging between 100 and 152 mm. The database covers unconfined concrete strengths from 20 to 50 MPa. The proposed model shows very good correlation with the experimental results. In addition, the proposed model also provides a comparative prediction of the strain of CFRP-confined concrete columns in two extreme cases, i.e., (1) insufficient confinement, and (2) heavy confinement, which are not usually well predicted by other models.

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Section: Strain Energy and Energy Absorptionmentioning

confidence: 99%

“…The energy absorption is sensitive to the geometry of the column (Wolff et al 1994). Thus, equations simulating the relationship between the absorption energies of a column and CFRP distinguish square from circular specimens.…”

Section: Strain Estimation For Square Sectionsmentioning

confidence: 99%

Strain Estimation of CFRP-Confined Concrete Columns Using Energy Approach

Pham

Hadi

2013

J. Compos. Constr.

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Hybrid reinforced thermoset polymer composite in energy absorption tube application: A review

et al. 2018

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Constraint Effects on Energy Absorption in Unidirectional PMC Tubes

Abdel-Haq

Broggiato

Newaz

1999

Journal of Composite Materials

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An investigation was carried out to understand the effect of an external constraint on the failure modes and energy absorption capability of unidirectional polymeric composite (PMG) tubes. The constraint was a steel ring that was tightened on the outside of the tube. This ring could slide during tube crushing. The tightness of the ring was determined using a strain gage positioned on the ring. The effect of the constraint was shown to depend on the initial position of the ring along the tube. The study was performed on fiberglass/polyester tubes and the results showed that the external constraint not only can improve the specific energy absorption of the tubes, but also can reduce significantly the undesired high initial peak loads. A nonlinear finite element approach was used to model the fundamental failure modes that dominate the energy absorption of the tubes with an external constraint. These modes including delamination and longitudinal crack propagation (splitting), were modeled using the finite element code ABAQUS. A user friendly FOR-TRAN subroutine was implemented to the code to incorporate the material failure model for predicting the fiber/matrix failures that occur as crushing is experienced by the tube. The predicted model results compared well with the experimental data for the various crushing stages of the polyester tubes.

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Relation of energy absorption of composite structures to material strength

Cited by 3 publications

References 11 publications

Strain Estimation of CFRP-Confined Concrete Columns Using Energy Approach

Strain Estimation of CFRP-Confined Concrete Columns Using Energy Approach

Hybrid reinforced thermoset polymer composite in energy absorption tube application: A review

Constraint Effects on Energy Absorption in Unidirectional PMC Tubes

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