Publications de Behzad Dehghan Manshadi

Post-wrinkling behavior of webs in GFRP cell-core sandwich structures

Thomas Keller, Anastasios Vassilopoulos, Behzad Dehghan Manshadi

Similarly to the post-buckling behavior of steel girder webs, the post-wrinkling behavior of glass fiber reinforced polymer (GFRP) cell-core sandwich webs can increase their ultimate shear strength. Post wrinkling is, however, different from post-buckling ...

Elsevier2016

An iterative analytical/experimental study of bridging in delamination of the double cantilever beam specimen

Anastasios Vassilopoulos, John Botsis, Behzad Dehghan Manshadi, Ebrahim Farmand Ashtiani

Large scale bridging in mode-I delamination of layered composites is an important toughening mechanism. While its extent depends on constituent materials, it is also influenced by specimen geometry. Here, an analytical approach is adopted to express the th ...

Elsevier2014

Monitoring strain gradients in adhesive composite joints by embedding fibre Bragg grating sensors

Véronique Michaud, John Botsis, Hans Georg Limberger, Georgios Violakis, Behzad Dehghan Manshadi, Luis Pablo Canal Casado

2013

An analytical model for lateral contraction of composite laminates subjected to partially uniform tension

Thomas Keller, Anastasios Vassilopoulos, Julia De Castro San Roman Fest, Behzad Dehghan Manshadi

An analytical approach to determine the in-plane stress field and thereby the lateral contraction of composite rectangular plates subjected to partially uniform tension is presented. This approach is based on the Green function hypothesis and is able to ac ...

Pergamon-Elsevier Science Ltd2013

A combined experimental/numerical study of the scaling effects on mode I delamination of GFRP

Anastasios Vassilopoulos, John Botsis, Behzad Dehghan Manshadi

Bridging by intact fibers is an important toughening mechanism in composite materials. However, a direct experimental evaluation of its contribution is difficult to achieve and in the case of large scale bridging the thickness, h, may have an important inf ...

Elsevier2013

Modeling of Buckling and Wrinkling Behavior in GFRP Plate and Sandwiches Subjected to Biaxial Compression–Tension Loading

Thomas Keller, Anastasios Vassilopoulos, Julia De Castro San Roman Fest, Behzad Dehghan Manshadi

A model for predicting the buckling and wrinkling behavior of glass-fiber-reinforced polymer (GFRP) plates and sandwich panels subjected to in-plane biaxial compression-tension loading is presented in this paper. In-plane biaxial compression-tension loadin ...

American Society of Civil Engineers2012

Instability of Thin-Walled GFRP Webs in Cell-Core Sandwiches under Combined Bending and Shear Loads

Thomas Keller, Anastasios Vassilopoulos, Julia De Castro San Roman Fest, Behzad Dehghan Manshadi

An analytical investigation of the buckling/wrinkling behavior of GFRP webs in cell-core sandwiches subjected to combined in-plane shear and bending stresses is conducted. Web-core panels are modeled as long orthotropic plates stabilized by a relatively th ...

2012

Biaxial Wrinkling of Thin-Walled GFRP Webs in Cell-Core Sandwiches

Behzad Dehghan Manshadi

Fiber-reinforced polymer (FRP) sandwich structures offer several advantages compared to structures made of traditional materials, such as high specific strength, good corrosion resistance, low thermal conductivity and rapid component installation. In this ...

EPFL2011

Contribution to shear wrinkling of GFRP webs in cell-core sandwiches

Thomas Keller, Anastasios Vassilopoulos, Julia De Castro San Roman Fest, Behzad Dehghan Manshadi

Glass-fiber-reinforced polymer (GFRP) cell-core sandwiches are composed of outer GFRP face sheets, a foam core, and a grid of GFRP webs integrated into the core to reinforce the shear load capacity. One of the critical failure modes of cell-core sandwich s ...

American Society of Civil Engineers2011

Shear buckling of GFRP beams webs

Thomas Keller, Anastasios Vassilopoulos, Julia De Castro San Roman Fest, Behzad Dehghan Manshadi

Slender webs of glass fiber-reinforced polymer (GFRP) beams are sensitive to shear buckling. Shear buckling can bee seen as an in-plane biaxial compression-tension buckling problem. The transverse tensile load thereby delays the onset of buckling and incre ...

Springer-Verlag New York, Ms Ingrid Cunningham, 175 Fifth Ave, New York, Ny 10010 Usa2011