About the dynamic strength enhancement of concrete-like materials in a split Hopkinson pressure bar test

Local impact effects of hard missiles on concrete targets

Modelling of compressive behaviour of concrete-like materials at high strain rate

Further investigation on the dynamic compressive strength enhancement of concrete-like materials based on split Hopkinson pressure bar tests. Part I: Experiments

Compressive behaviour of recycled aggregate concrete under impact loading

http://dprl2.me.gatech.edu/sites/default/files/PDFpub/ijie-part1.pdf

Dynamic behavior of concrete at high strain rates and pressures: I. experimental characterization

The failure behavior of mortar under dynamic impact loading is characterized through a series of plate impact experiments. The analysis focuses on the spall strength and the shear stress carrying capacity in different regions of the specimen under normal impact loading. Special attention is paid to the possible existence of a failure wave phenomenon that has been widely recognized as an important failure mechanism for glasses during plate impact. The experiments are designed to allow the strengths of the medium at locations behind and ahead of a possible failure wave front to be analyzed. The diagnostics used include velocity interferometer system for any reflector (VISAR) recording of the free surface velocities of targets and monitoring of the internal stresses via polyvinylidene fluoride (PVDF) gauges embedded in the specimen. Experiments conducted do not provide evidence for the existence of a failure wave phenomenon for mortar under plate normal impact loading. While the study suggests that a threshold impact stress must be exceeded for failure to occur, a clearly defined failure wave that propagates behind the loading wave is not observed. Instead, a gradual failure process that initiates upon the arrival of the loading wave and progresses thereafter is observed. This gradual failure process in mortar is in contrast to the well-defined failure front and complete loss of tensile strength associated with the failure wave phenomenon reported for glasses. The study also indicates that, under impact involving high levels of input stresses, attenuation of the loading wave occurs as it propagates through the failed medium.

http://dprl2.me.gatech.edu/sites/default/files/PDFpub/jap02115%5b1%5d.pdf

Experimental characterization of the dynamic failure behavior of mortar under impact loading

The dynamic failure behavior of mortar under impact loading is characterized through plate impact experiments. The study concerns the possible existence of failure waves in mortar. The analysis focuses on the spall strength in different regions of impacted specimens and the evolution of longitudinal and transverse stresses under normal impact loading. The diagnostics used are VISAR interferometry for surface velocity measurement and embedded PVDF gauges for internal stress measurement. Experiments conducted do not provide evidence for the occurrence of failure waves. While the study suggests that a threshold impact velocity is required to initiate failure, a clearly defined failure wave that propagates behind the loading wave is not observed. Instead, a gradual failure process initiating at the arrival of the compressive wave is found. This gradual failure process is in contrast to the well-defined failure front in the failure wave phenomenon in glasses.

D. L. Grote

Papers

Dynamic behavior of concrete at high strain rates and pressures: I. experimental characterization

Experimental characterization of the dynamic failure behavior of mortar under impact loading

An experimental characterization of the dynamic impact failure of mortar