Quasi-static tensile tests were performed to determine the tensile strength, modulus and breaking strain of the LDPE and WFRP. These tests were also performed to establish testing conditions for tensile stress relaxation experiments.
Tensile stress relaxation experiments were performed on the WFRP and LDPE specimens according to ASTM E328-96 (15) using a computer controlled screw-driven tensile testing machine equipped with a chamber having temperature control to within [+ or -] 1[degrees]C.
Quasi-static flexure tests were conducted on rectangular specimens: LDPE injection molded to 130 X 12.8 X 3.2 mm; WFRP compression molded and saw cut to 150 X 12.8 X 4 mm.
A standard wood screw (10-12), a specialized screw for plastics (10-16), and two types of internally threaded inserts were used to evaluate the fastening properties of WFRP (Figs.
Table 2 shows that the quasi-static strength and stiffness of WFRP were greater than those of the LDPE matrix.
As expected, the initial modulus of WFRP in the tensile stress relaxation experiments was higher at low temperature than at high temperatures (Fig.
WFRP is available to more farms and has higher premium subsidy rates than AGR and AGR-L.
Farms with CAT coverage are not eligible for WFRP. WFRP is available with other crop insurance plans purchased at buy-up coverage levels that exceed the basic CAT coverage.
At least three characteristics of WFRP may affect the efficiency of the federal crop insurance program.
Information on the liability, premium, premium subsidy, indemnity, and loss ratio for WFRP and all other federal crop insurance programs in 2015 is reported in Table 2.
The most popular coverage level for WFRP was 75%, accounting for 67% of the total liability, 67% of premium paid, 69% of premium subsidies, and 60% of indemnity payments.