Test piece with negative Poisson ratio performance

The invention discloses a test piece with negative Poisson ratio performance. A plurality of arc bodies are embedded into a substrate material. The arc bodies on the left and right sides of the test piece are distributed in a mirror symmetry way; the arc bodies on the same side are same in bent radians and distributed at equal intervals but different in elastic modulus, rigidity and substrate materials. The arc bodies are embedded in the forced direction of the test piece, or after the substrate of the test piece is solidified, the arc bodies embedded in the forced direction of the test pieceare pulled out, or the arc bodies are processed on the test piece of the whole substrate material in a strengthening and machining manner or formed by chemical reaction. The arc bodies comprise fibre-reinforced arc bodies, foam-weakened arc bodies, arc-shaped splits, multi-stage bent arc bodies, multi-radian bent arc bodies and scale-shaped arc bodies. The test piece has expansibility in the vertical direction when pulled