For a cantilever beam loaded in bending, prove that b = 2/3 for the Sβ/ρ guidelines in Fig.2€“19.

10000 Ceramics Strength-density Si3N4 Ti alloys Composites Steels Metals SiC l alloys Ni alloys Metals and polymers yield strength Ceramics and glasses MGR Elastomers tensile tear strength Composites tensile failure Tungsten 1000 Polymers and elastomers Mg alloys GFRP PEEK Tungsten PA Wood pVMMA 100 Il to grain Natural materials Rigid polymer foams inc alloys Lead alloys Foams ButySilicone crete Guide lines for Wood I to grain elastomers nnI mass Cork design 1/2 Flexible polymer foams MFA D4 0.01 0.01 10 Density p, Mg/m