Abstract Fiber metal laminate (FML) is a damage‐tolerant material that has gained special attention in the aircraft industry. To clarify the confusing contributions of constituents to the quasi‐static fracture performance and failure mechanism, six kinds of glass fiber reinforced aluminum laminates (Glare) were designed. Quasi‐static fracture tests were carried out to examine their crack resistance, stable crack extension, and residual strength. Moreover, postmortem characterizations were performed to reveal the macro and micro failure morphologies. It was found that the glass fiber reinforced polymer (GFRP) layers can positively contribute to Glare's quasi‐static fracture performance due to its in‐situ quasi‐brittle but not completely brittle fracture characteristics, which was shown by the special plateau formed on P –Δ a curve of Glare, and by the improved crack resistance, longer critical crack length, and higher residual strength in Glare with higher content of GFRP. However, the enhancement achieved by increasing the volume fraction of GFRP was not as effective as by increasing the aluminum thickness, since thickening aluminum in a limited range could increase the fracture toughness and promote the delamination and fiber pull‐outs in Glare. To further identify the effect of the properties of the metal layer, a titanium‐reinforced Glare was designed and tested. It was found to transform the fracture process to be titanium dominant, which delayed the fracture of GFRP and meandered the fracture path, then resulted in superior quasi‐static fracture performance than the basic Glare.
As to the disadvantages of flanneled and static flocking top roller clearers,introduction is given to the sponge rubber top roller clearer regarding the formula and process manufacturing.Conclusion is made that the sponge rubber top roller clearer is superior over the above mentioned flanneled and static flocking top roller clearers in process,application effect,way of application and cleaning.It has excellent performance of absorbing and clearing,and easy access to cleaning,thus lowering cost of production and gaining profit.It is worthy of promotion.
Transformation of microstructure and chamical bond of β-C2S monomineralic rock under action of high energy ball milling was studied by X-ray diffraction technology and infrared spectrometry.The results show that under the continue mechanical action,all of dimension,microstrain and effective Beff parameter of β-C2S crystal increased and it had obvious phrase which resulted in breaking and recombining of Si-o bond,increase of the vibration energy and out-of-order crystal,and in the end,β-C2S crystal finished mechanical chemical transformation and its reactivity improved.
The formulation and process of foaming rubber product based on NR prepared by filling mould under normal pressure were researched. The foaming and thick rubber goods with smooth surface, good feeling and good elasticity was prepared through hot air cure under normal pressure by varied foaming system and cure system.
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