Characterization of triaxial piezoresistive high-g accelerometer by Hopkinson bar method

The aims of this thesis are to establish the criteria about the duration of input acceleration pulses in the accelerometer calibration, to generate the input pulses with required durations by designing 2 different calibration devices through changing the bullet bottom shape, explosive impulse and changing the geometric dimensions of the Hopkinson bar.

The dynamic splitting tests of marble using Brazilian disc and flattened Brazilian disc were performed at high strain rate with split Hopkinson pressure bar(SHPB) of 100 mm diameter.

Then,after 3 and 7 days standard curing,impact properties of basalt fiber reinforced geopolymeric concrete(BFRGC)and carbon fiber reinforced geopolymeric concrete(CFRGC) were investigated using a 100-mm-diameter split Hopkinson pressure bar(SHPB) apparatus,and comparison between the results of experiments was performed.

The dynamic response of FBG is researched by shock test in split Hopkinson pressure bar(SHPB) and the results indicate that FBG can measure the shock signal exactly and the demodulator is able to interrogate high frequency excitation signal fast and accurately.

This paper describes a modification of the split Hopkinson pressure bar for the dynamic compressive property testing of soft material.

The dynamic mechanical behaviour of RPC with different fiber volume fraction was researched on repeated compressive impact in four kinds of impact modes with the split Hopkinson pressure bar.

An experiment method of using the split Hopkinson pressure bar(SHPB) is proposed to perform dynamic split testing of brittle materials like concrete at a high strain rate,and the currently accepted method for the experiment is to obtain the tensile strength and the average strain rate by the transmitting wave signals.