El Centro Earthquake, North-South Component 31 12 Half-Sine Pulse, 10 G, 11 msec 25 32 V-band/Bolt-Cutter Source Shock 11 15 The peak velocity comparison is useful, but a consideration of natural frequency is still needed because the dynamic range is greater than zero, at least 12 dB, in each case. APPENDIX R Velocity Limits of Materials Gaberson gave the following limits in Reference 4. Table R-1. Severe Velocities, Fundamental Limits to Modal Velocities in Structures Rod Beam Plate Material E (psi) (psi) Vmax Vmax Vmax (lbm/in^3) (in/sec) (in/sec) (in/sec) Douglas Fir 1.92e+06 6450 0.021 633 366 316 Aluminum 10.0e+06 35,000 0.098 695 402 347 6061-T6 Magnesium 6.5e+06 38,000 0.065 1015 586 507 AZ80A-T5 33,000 226 130 113 Structural Steel, 29e+06 0.283 High Strength 100,000 685 394 342 APPENDIX S Characteristic Impedance Values
El Centro Earthquake, North-South Component 31 12 Half-Sine Pulse, 10 G, 11 msec 25 32 V-band/Bolt-Cutter Source Shock 11 15 The peak velocity comparison is useful, but a consideration of natural frequency is still needed because the dynamic range is greater than zero, at least 12 dB, in each case. APPENDIX R Velocity Limits of Materials Gaberson gave the following limits in Reference 4. Table R-1. Severe Velocities, Fundamental Limits to Modal Velocities in Structures Material E (psi) (psi) (lbm/in^3) Rod Vmax (in/sec) Beam Vmax (in/sec) Plate Vmax (in/sec) Douglas Fir 1.92e+06 6450 0.021 633 366 316 Aluminum 6061-T6 10.0e+06 35,000 0.098 695 402 347 Magnesium AZ80A-T5 6.5e+06 38,000 0.065 1015 586 507 Structural Steel, High Strength 29e+06 33,000 100,000 0.283 226 685 130 394 113 342 APPENDIX S Characteristic Impedance Values
sv_velocity_revB.docx