Composites boron/epoxy

The preceding restrictions on engineering constants for orthotropic materials are used to examine experimental data to see if they are physically consistent within the framework of the mathematical elasticity model. For boron-epoxy composite materials, Dickerson and DiMartino [2-3] measured Poisson s ratios as high as 1.97 for the negative of the strain in the 2-direction over the strain in the 1-direction due to loading in the 1-direction (v 2)- The reported values of the Young s moduli for the two directions are E = 11.86 x 10 psi (81.77 GPa) and E2 = 1.33x10 psi (9.17 GPa). Thus,... 

Figure 3-37 E2 Calculations for a Boron-Epoxy Composite Material (After Halplrt and Tsai [3-17])...

Lager and June compared Dow and Rosen s theoretioefl prec(ictions with experimental results for boron-epoxy composite materials thaf have two different matrix materials [3-33]. The theory appears to correlate well with the data if the matrix moduli in Equations (3.119) and (3.136) are multiplied by. 63, that is. 

Compressive Strength of Boron-Epoxy Composite Materials (After Lager and June [3-33])... 

John R. Lager and Reid R. June, Compressive Strength of Boron-Epoxy Composites, Journal of Composite Materials, January 1969, pp. 48-56. 

Typical S-N (stress versus number of cycles) curves for various metals and composite materials are shown in Figure 6-4 [6-3]. The boron-epoxy composite material curve is much flatter than the aluminum curve as well as being flatter than the curves for any of the metals shown. The susceptibility of composite materials to effects of stress concentrations such as those caused by notches, holes, etc., is much less than for metals. Thus, the initial advantage of higher strength of boron-epoxy... 

Boron has high neutron absorption and the boron-aluminum composites are being investigated for nuclear applications. Single-ply boron-epoxy composites have microwave polarization properties with potential applications in antenna and radome designs. 01... 

Fitz-Randolph J., Phillips D.C., Beaumont P.W.R. and Tetelman A.S. (1972). The fracture energy and acoustic emission of a boron-epoxy composite. J. Mater. Sci. 7, 289-294. 

Atkins A.G, and Mai Y.W. (1976). Effect of water and ice on strength and fracture toughness of intermittently bonded boron-epoxy composites J. Mater. Sci. II, 2297-2306. 

Fig. 1. Thermal expansion vs. temperature for copper. Inconel 718, and a boron-epoxy composite.

R P Carnso, Repair of metallic aircraft structures utilizing boron/epoxy composites , International Encyclopedia of Composites, ed. S M Lee, New York, VCH, 1989, Volnme 5. 

Boron-epoxy composite n. A composite in which boron fibers are embedded in an epoxy matrix. Modulus is about 200 GPa, tensile strength about 1.6 GPa, rising with fiber content. The combination of high specific modulus and high specific strength has made these composites attractive for aerospace vehicles in spite of their high cost. Harper CA (ed) (2002) Handbook of plastics, elastomers and composites, 4th edn. McGraw-Hill, New York. 

Table 4.13 Properties of Typical Unidirectional Boron/Epoxy Composites (from Ref. 10)...

Fig. 26. Delaminalion of boron-epoxy composite laminate caused by poor step-plate detail.

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