Properties and application prospects of the hottes

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Performance and application prospect of pet foam

in sandwich structure, the strength and stiffness of sandwich material are much lower than that of surface material, but it plays a magical effect of "pulling a thousand pounds in four directions" in sandwich structure, which can greatly improve the stiffness and load resistance of the structure. Yao Hui from the core business department of Alcan composite group introduced the new pet foam Airex? T92, its mechanical properties have been greatly enhanced, especially the shear elongation has been unprecedentedly improved. The foam can be used as a sandwich material in various fields such as wind turbine blades, rail transit, shipbuilding and industrial applications

the pet foam Airex T90 and T91 of the core materials division of Alcan Composites Group have achieved great success since their launch in 2005, and have been widely used in wind turbine blades, rail transit, shipbuilding and industrial applications. By producing Airex T90 and T91, Airex has accumulated rich experience and exquisite skills, which also enables it to successfully develop and launch the new pet foam Airex T92

the static and dynamic mechanical properties, mechanical properties at high and low temperatures and prospects of the new pet foam Airex T92 are introduced in this paper

static mechanical properties

airex T92 series contains products with three densities: t92.100, t92.110, t92.130, and the Density specifications are 105 kg/m3115 kg/m3 and 135 kg/m3 respectively. In this paper, the mechanical properties of T92 are compared with those of the corresponding products of T91, which are listed in Table 1; The mechanical properties of T92 are also compared with the commonly used PVC foam Airex C70 and C71 related products. The results are listed in Table 2 and table 3

Table 1: the mechanical property data of T92 and T91 "MOLP" project is mainly compared with the material researchers in the company

(the property of T91 is 100%)

from table 1, it can be seen that compared with T91, the density of T92 decreases, and the strength and modulus are improved or remain unchanged; The most prominent is that the shear elongation of T92 is 15%, which is that of T91 5 times, reaching the magnitude of PVC foam (such as the shear elongation of c70.55, which is commonly used, is 16%), breaking through the weakness of "brittleness" of traditional pet foam

Table 2: comparison of mechanical property data between t92.100 and c70/c71

(the performance of t92.100 is 100%)

Table 3: comparison of mechanical property data between t92.130 and c70/c71

(the performance of t92.130 and even 90% is 100%)

* among them, the density of c70.55 is 60 kg/m3, the density of c70.75 is 80 kg/m3, the density of c71.55 is 60 kg/m3, and the density of c71.75 is 80 kg/m3

from table 2 and table 3, it can be seen that compared with c70.55/c71.55, the compression performance of t92.100 is higher than c70.55/c71.55, and the shear performance is basically the same; Compared with c70.75/c71.75, t92.100 has lower compression and shear properties than c70.75/c71.75; The compression performance of t92.130 is higher than c70.75/c71.75, and the shear performance is higher than or equal to c70.75/c71.75

compressive strength at high and low temperatures

in the molding process of composite sandwich structures, the core material often has to withstand the test of high temperature. For vacuum pouring, prepreg and other processes, the core material needs to bear a certain pressure at high temperature. Figure 1 shows the compression strength of t92.100 at the temperature of 0 ℃ -150 ℃. It can be seen that t92.100 still has a compression strength higher than 0.1 MPa at the high temperature of 150 ℃ by controlling the loading positive pressure and lateral force, that is, it can withstand the pressure of 1 atmospheric pressure (vacuum bag pressure) without being crushed at the high temperature of 150 ℃

Figure 1 compression strength temperature trend line of t92.100 at 0 ℃ -150 ℃

fatigue resistance

Figure 2 is the fatigue test comparison curve of t92.100, c70.55 and c70.75. The curve shows that the fatigue strength of t92.100 is higher than c70.55. When the test reaches 10million times (10 MIO), the fatigue strength of t92.100 even exceeds c70.75. Therefore, for wind turbine blades, yachts, rail transit and other products that need to bear multi cycle fatigue loads, iRex? T92 has outstanding advantages

Figure 2 fatigue test S-N curve

Application and prospect

iRex T92 has excellent comprehensive performance, especially the shear elongation is two to three times that of similar pet foam, reaching the magnitude of PVC foam. This breakthrough eliminated the weakness of "too fragile" that originally limited the application of pet foam, and created a new era of pet foam

for composite products that bear fatigue load for a long time, airex4.2.3 scanning time calculation formula T92 shows greater advantages than PVC foam. The foam can withstand the curing temperature of 150 ℃ for a short time, so it can be used in various prepreg systems and other processes with high temperature resistance requirements. In addition, the iRex T92 process is easy to operate and applicable to all resin systems and process technologies. By comparing with the most commonly used PVC foam, it is found that the foam fully meets the technical requirements of wind turbine blades

before the successful launch of iRex T92, iRex T91 has been successfully applied to yachts, wind turbine blades, rail transit and other products. IRex T92, which has excellent comprehensive properties, has been comprehensively improved on the basis of T91. It will become another wise choice for the core material of composite sandwich structure. (end)

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