4 results about "Spall" patented technology

The application provides a kind of anti-explosion glass compression resistance performance multidimensional analysis method, belongs to the technical field of testing the strength characteristics of solid materials by applying pressure, the method comprises: in the process of applying compression load to anti-explosion glass sample by pressure head, hardware synchronous trigger and parallel acquisition three-dimensional force-displacement time history signal of compression contact surface, high-speed full-field strain image sequence of sample back and piezoelectric sensor array vibration waveform signal;Time-frequency analysis on vibration waveform signal, match strain concentration area to identify micro-crack propagation, interlaminar delamination and other damage events, quantify the distribution ratio and evolution process of work done by external force in structural deformation, material damage dissipation and fragment splashing kinetic energy during compression process;Calculate effective energy dissipation ratio, dominant failure mode evolution sequence and other indicators to generate dynamic evolution spectrum of compression resistance performance.The application realizes the accurate evaluation of the protection efficiency, failure mechanism and critical point of anti-explosion glass under compression load.

The application discloses a kind of plating adhesion detection system and detection method, belong to metal material surface plating detection technical field.Detection system includes deformation mould, flat mould and hydraulic press, deformation mould includes bi-convex upper die and bi-concave lower die, respectively installed on hydraulic press for sample stamping deformation;Flat mould can be detachably installed on hydraulic press, for flattening after sample deformation.Detection method includes: sample is placed on bi-concave lower die, and hydraulic press drives bi-convex upper die to go down and carries out simulation stamping deformation;After sample deformation, it is placed into flat mould and flattened;Paste adhesive tape in flattening area and tear, observe whether to take out plating fragment to judge adhesion.The application truly simulates the composite stress under the condition of stamping R angle or flanging by bi-convex upper die and bi-concave lower die cooperation, combined with flat tape detection, with the advantages of simple structure, low cost, convenient operation, high detection accuracy, suitable for galvanizing, aluminizing steel coil production line on-site rapid off-line detection.

A preformed composite fragmentation warhead includes preformed composite fragments tightly packed around a casing that includes an explosive. The preformed composite fragments include an inner core encapsulated with an outer jacket. The inner core and outer jacket are formed from different metal materials with the density of the material for the outer jacket being lower than the density of the material for the inner core. Upon contact with a “soft” target, the outer jacket deforms and widens to increase the diameter of the preformed composite fragment. Upon contact with a “hard” target, the outer jacket erodes or shatters allowing the inner core to penetrate the hard target. The outer jacket also serves to reduce spalling upon detonation of the warhead explosive. The outer jacket fully encapsulates the inner core to ensure that the outer jacket impacts the target.