TY - RPRT TI - Toughening mechanisms in ceramic composites- semi-annual progress report for the period ending September 30, 1988 AU - Fuller, E R Jr AU - Krause, R F Jr AU - Vaudin, M D, AU - Palamides, T R PY - 1989 PB - National Institute of Standards and Technology CY - Gaithersburg, MD SN - NIST IR 88-4018 DO - 10.6028/NIST.IR.88-4018 ER -