Experimental Validation of Dynamic Fragmentation Simulations

نویسندگان

  • Vijaya B. Chalivendra
  • Soonsung Hong
  • Ares J. Rosakis
  • Jaroslaw Knap
  • Michael Ortiz
چکیده

Large scale simulations using cohesive zone interfacial elements were used to understand features such as penetration and deflection of crack during the process of interaction of mode-I crack with inclined interfaces. To perform these simulations, two set of inputs are necessary. The first one is to provide valid loading boundary conditions and the second one is to incorporate accurate cohesive zone laws in the dynamic fracture of the simulated specimen. To meet the first input, a modified Hopkinson bar setup has been used to accurately control initial and boundary conditions. In case of second one, an inverse formulation approach will be used to extract cohesive zone laws for both mode-I and mixed mode conditions. Dynamic photoelasticity coupled with high-speed photography is used to capture real-time experimental records associated with crack propagation. An initial experimental study has already been conducted to identify important parameters that affect the penetration and deflection behavior. It has been observed that incoming crack tip velocity and mode mixity have influence on the nature of crack propagation along the interface. To validate these observations, an extensive set of well controlled experiments will be conducted. A comparison of simulation results with those of experiments will be presented.

برای دانلود متن کامل این مقاله و بیش از 32 میلیون مقاله دیگر ابتدا ثبت نام کنید

ثبت نام

اگر عضو سایت هستید لطفا وارد حساب کاربری خود شوید

منابع مشابه

Validation of Massively Parallel Simulations of Dynamic Fracture and Fragmentation of Brittle Solids

Massively parallel finite element simulations of dynamic fracture and fragmentation of brittle solids are presented. Fracture is introduced by the adaptive insertion of cohesive elements. The model is validated against specially designed experiments in a collaborative effort between the experimental and the computational groups. Mesh sensitivity issues are addressed through the renormalization ...

متن کامل

Numerical simulation of hull and propeller interaction in acceleration maneuver

Prediction of a ship’s trajectory during a maneuvering motion is so important. In this study, the acceleration maneuver for a twin-screw vessel is directly investigated using computational fluid dynamic (CFD) environment and unsteady RANS (Reynolds Averaged Navier-Stokes) solver. For this purpose, the self-propulsion and acceleration simulations with hull and propeller interaction for the well-...

متن کامل

Dynamic Photoelastic Validation of Large Scale Fracture and Fragmentation Simulations

A detailed experimental and numerical investigation has been performed to validate large scale numerical simulations of dynamic crack propagation, branching, deflection, and penetration at interfaces in brittle homogeneous materials. High-speed photography in conjunction with the dynamic photoelasticity has been used to observe real-time failure mode transition mechanism at the interfaces. Wedg...

متن کامل

New approach to grain fragmentation for discrete element methods

This article presents a new approach to grain fragmentation, its implementation in a discrete element method code, and an experimental validation. This approach is an improvement, compared with those models currently available in the literature. This new approach includes the use of polygonal particles, an estimation of stresses within the particles, a failure criterion, and a mode of rupture. ...

متن کامل

Exploring the Physics behind Dynamic Fragmentation through Parallel Simulations

The physical mechanisms underlying the dynamic fragmentation of heterogeneous brittle materials are explored through numerical simulations. The use of computational facilities, rather than experimental or fundamental sciences, ensures the accurate tracking of rapidly evolving fields (such as stress field, energies and damage). The numerical framework is based on Galerkin approximations coupled ...

متن کامل

ذخیره در منابع من


  با ذخیره ی این منبع در منابع من، دسترسی به آن را برای استفاده های بعدی آسان تر کنید

برای دانلود متن کامل این مقاله و بیش از 32 میلیون مقاله دیگر ابتدا ثبت نام کنید

ثبت نام

اگر عضو سایت هستید لطفا وارد حساب کاربری خود شوید

عنوان ژورنال:

دوره   شماره 

صفحات  -

تاریخ انتشار 2005