Counting carbon fibres by electrical resistance measurement

Through-thickness stress sensing of a carbon fiber polymer--matrix composite by electrical resistance measurement

Through-thickness stress self-sensing in a quasi-isotropic carbon fiber epoxy–matrix composite by in-plane electrical resistance measurement is effective. The resistance decreases reversibly upon through-thickness compression conducted up to 67 MPa, due to an increase in the proximity between adjacent laminae. The sensing can be attained by measuring the surface resistance in the direction of t...

Numerical assessment of the methods of measurement of the electrical resistance in carbon fiber reinforced cement

Carbon fiber reinforced cement is a smart material due to its sensing ability, which is based on piezoresistivity. A finite element model for simulating the measurement of electrical resistance in this material is provided. The measured four-probe resistance decreases with increasing distance between the adjacent voltage and current contacts. For a beam of size 320 × 40 × 40 mm3, the minimum di...

Effect of through-thickness compression on the microstructure of carbon fiber polymer-matrix composites, as studied by electrical resistance measurement

Compression in the through-thickness direction (as in fastening) resulted in reversible and irreversible changes in the microstructure of continuous carbon fiber epoxy-matrix composites, as shown by electrical resistance measurement during dynamic compression. The extent of fiber-fiber contact across the interlaminar interface was increased, with partial irreversibility even at a low stress amp...

Correlating electrical resistance to growth conditions for multiwalled carbon nanotubes

Is an acupuncture point identifiable with skin electrical resistance measurement?

INTRODUCTION One of the basic beliefs of traditional acupuncture is that needling and massaging on certain skin areas called acupuncture points (AP) help to treat medical conditions. While acupuncture is widely accepted as a useful non-pharmacological method for pain reduction, the mechanism of acupuncture is still debated— whether it works through the mechanical stimulation of skin and muscle ...