000004797 001__ 4797
000004797 005__ 20141119144554.0
000004797 04107 $$aeng
000004797 046__ $$k2002-06-02
000004797 100__ $$aEl-Hajjar, Rani F.
000004797 24500 $$aFRACTURE TESTING AND MICROMECHANICAL ANALYSIS OF PULTRUDED COMPOSITES

000004797 24630 $$n15.$$pProceedings of the 15th ASCE Engineering Mechanics Division Conference
000004797 260__ $$bColumbia University in the City of New York
000004797 506__ $$arestricted
000004797 520__ $$2eng$$aAn experimental and analytical study is carried out to characterize the fracture behavior of fiber reinforced plastic (FRP) pultruded composites. The composite material system used in this study consists of roving and continuous filament mat (CFM) layers with E-glass fiber and polyester matrix materials. Eccentrically loaded single-edge-notch-tension ESE(T) fracture toughness specimen were cut with the roving transverse to the loading direction from a monolithic pultruded plate with 0.5" thickness. The fracture toughness of this material is characterized for a notch parallel to the roving direction, the plane with the lowest fracture toughness. A three-dimensional (3D) micromechanical constitutive model is developed and calibrated for the composite material system. This nonlinear constitutive model is a combination of nested micromechanical models for the roving and CFM layers. The ability of the proposed micromodel to predict the effective elastic properties as well as the nonlinear response under multi-axial stress states is verified and compared to the stress-strain response from off-axis tests. The 3D constitutive model is used with a cohesive layer in a finite element analysis (FE) to study the fracture response. The properties for the cohesive layer were calibrated from an ESE(T) specimen with the ratio a/W=0.5. Good prediction from the proposed model is reported for a range of notch sizes and geometries.

000004797 540__ $$aText je chráněný podle autorského zákona č. 121/2000 Sb.
000004797 653__ $$apultruded and thick composites, fracture testing, micromechanical models.

000004797 7112_ $$a15th ASCE Engineering Mechanics Division Conference$$cNew York (US)$$d2002-06-02 / 2002-06-05$$gEM2002
000004797 720__ $$aEl-Hajjar, Rani F.$$iHaj-Ali, Rami M.
000004797 8560_ $$ffischerc@itam.cas.cz
000004797 8564_ $$s1513439$$uhttp://invenio.itam.cas.cz/record/4797/files/350.pdf$$yOriginal version of the author's contribution as presented on CD, .
000004797 962__ $$r4594
000004797 980__ $$aPAPER