1060 aluminum alloy 2A14 aluminum alloy L-shaped ultrasonic wave guide rod Lamb wave Monte Carlo method SHM Technology: general issues axicon lens bulk metallic glass capillary penetration composite manufacturing composition segregation concrete creep cutting force damage identification early age elastography finite element analysis focused ultrasound guided waves heterogeneity liquid composite molding liquid penetration material characterization mechanical properties mesostructure microstructure mortar and concrete non-destructive inspection