As the strain is increased, the distance between the coil and magnetite print is increased and the tension caused by the bend rig would align the moments toward the stress direction, which would naturally assume a negative trend.
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Inkjet Printing Magnetostrictive Materials for Structural Health Monitoring of Carbon Fibre-Reinforced Polymer Composite.
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The sentences
The intercept shows the initial inductance value where no strain is applied, which may be significant to compare with other designs such as increased layers.