Notiz über den Bau des PbIV-Spektrums

Zeitschrift für Physik A Hadrons and nuclei -     

Crystallization behaviors of Al-Ni-La amorphous alloys with trace Ti and B

Effects of the single or simultaneous addition of trace Ti and B (?1 at.%) on the glass-forming ability (GFA) and crystallization behaviors of Al₈₈Ni₆La₆ and Al₈₉Ni₆La₅ amorphous alloys were investigated by X-ray diffraction and differential scanning calorimetry. The addition of trace Ti and B deteriorates the GFA, but improves the thermal stability especially if Ti is added singly. The crystallization onset temperature T_x1 of the first exothermic peak increases by 29.5 and 18.0 K when 1% of the Al atoms in Al₈₈Ni₆La₆ and Al₈₉Ni₆La₅ are replaced by Ti, respectively. However, the primary phase during annealing remains unchanged.     

Photoelastic studies on progress of separation in interference fits

Interference fits are used extensively in aircraft structural joints because of their improved fatigue performance. Recent advances in analysis of these joints have increased understanding of the nonlinear load-contact and load-interfacial slip variations in these joints. Experimental work in these problems is lacking due to difficulties in determining partial contact and partial slip along the pin-hole interface. In this paper, an experimental procedure is enumerated for determining load-contact relations in interference/clearance fits, using photoelastic models and applying a technique for detecting progress of separation/contact up to predetermined locations. The study incorporates a detailed procedure for model making, controlling interference, locating break of contact up to known locations around the interface, estimating optically the degree of interference, determining interfacial friction and evaluating stresses in the sheet. Experiments, simulating joints in large sheets, were carried out under both pin and plate loads. The present studies provide load-separation behavior in interference joint with finite interfacial friction.