GB/T 46217-2025Test method of ionizing radiation effect for polymer-based piezoelectric composites (English PDF)

3.1

Functional materials composed of piezoelectric materials and polymers.

3.2 piezoelectric effect

Piezoelectric materials generate polarization charges under mechanical force (positive piezoelectric effect) or deform under an external electric field (inverse piezoelectric effect). Phenomenon.

[Source. GB/T 3389.1-1996, 4.12, with modifications]

3.3 [Source. GB/T 3389.1-1996, 6.14, with modifications]

The parameter reflecting the coupling relationship between the mechanical and electrical quantities of the piezoelectric effect (3.2) is defined in formula (1). dij= dDi dTj E,Tn dSj dEi T,Em (i,m=1,2,3,m !=i;j,n=1,2,,6,n!=j)(1) In the formula.

dij --- piezoelectric strain constant;

i --- The polarization direction of the material or the direction in which the electric field is applied;

j --- The direction of applied stress or induced strain;

Di --- Electric displacement component, in coulombs per square meter (C/m2);

Tj --- Stress component, in Newtons per square meter (N/m2);

Sj --- Strain component, dimensionless;

Ei --- Electric field intensity component, measured in volts per meter (V/m).

Note 1.The piezoelectric strain constant reflecting the positive piezoelectric effect is the positive piezoelectric strain constant, with units of coulombs per newton (C/N); the piezoelectric strain constant reflecting the inverse piezoelectric effect is...

The constant is the inverse piezoelectric strain constant, with units of meters per volt (m/V). For ease of distinction, the inverse piezoelectric strain constant is usually represented by dij*.

Note 2.The piezoelectric strain constant within the principal plane of the specimen (referred to as in-plane) is denoted by the symbol dij_in; the piezoelectric strain constant perpendicular to the principal plane (referred to as out-of-plane) is denoted by the symbol dij_in.

The symbol dij_out represents this.

3.4 ionizing radiation

Any type of radiation, including charged particles, uncharged particles, or both, such as alpha particles, beta particles, X-rays, gamma rays, neutrons, and matter.

The radiation interacts with the material, ionizing it through initial or secondary processes.

3.5 Total ionizing dose

The energy accumulated per unit mass of material during ionizing radiation.

Note. The SI unit for total ionizing dose is the gray (Gy). One gray is equivalent to one kilogram of a certain material absorbing one joule of radiation energy (1 Gy = 1 J/L).

kg). Another commonly used unit is rad, 1 Gy = 100 rad.

3.6 Dosage rate

The total ionization dose of the material per unit time.

Note. The unit is gray per hour (Gy/h).

5.1 Performance Testing Environment

Performance testing should be conducted at a temperature of (23±2)°C and a relative humidity of (50±10)%.

5.2 Ionizing Radiation Test Environment

Ionizing radiation was conducted using a 60Co gamma radiation source at a temperature of (23±2)°C and a relative humidity of (50±10)%.

6.1 Piezoelectric strain constant specimen

6.1.1 Number of Samples

Each group should have no fewer than 3 valid samples.