Mechanical properties of bimaleimide matrix composites and the performance of its component
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Abstract:
Bismaleimide matrix composites (abbreviated as MT700/802) reinforced by domestic carbon fiber (MT700) were prepared by autoclave process. The properties of tensile, compressive and in-plane shear for quasi-isotropic laminates were comprehensively studied at room temperature and at -55 °C. The experimental results showed that 90° compressive strength and 0° in-plane shear strength at -55 °C were improved by 10% than those at room temperature, however, both of 0° and 90° tensile strength and modulus at -55 °C were reduced by near 9% than those at room temperature. Meanwhile, a component with local variable thickness was developed, and it was tested under the working condition of tensile and shear load. The results exhibited that the tensile failure load of the component run at 31.45 kN and the shear failure load was more than 54.11 kN.Keywords:
Autoclave
Pervious concrete
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In this paper, we discuss five parameters that indicate the inhomogeneity of a stack of parallel isotropic layers. We show that, in certain situations, they provide further insight into the intrinsic inhomogeneity of a Backus medium, as compared to the Thomsen parameters. Additionally, we show that the Backus average of isotropic layers is isotropic if and only if $\gamma=0$. This is in contrast to parameters $\delta$ and $\epsilon$, whose zero values do not imply isotropy.
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The paper reports on investigation of the relationship between concrete compressive strength and its splitting tensile strength, especially at early ages, as well as the examination of the applicability of some of the existing relations between these properties to concrete at early ages. Analyses of test results show that the compressive strength and the spliltting tensile strength are related, and an increase in one, in general is similarly reflected in an increase in the other. The commonly accepted 0.5 power relationship between the compressive strength and the spliltting tensile strength was found to be inaccurate at all ages. In fact the tensile strength was found to be proportional to the 0.79 power of the cylinder compressive strength. An alternate relationship between the tensile strength and the compressive strength is proposed. Tables of results and figures supporting these observations and conclusions are included.
Tensile testing
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Abstract The new title compound is hydrothermally prepared from aqueous mixtures of ZnO, Li 2 CO 3 , and HIO 3 (autoclave, 200 °C, 7 d, 80% yield).
Autoclave
Hydrothermal reaction
Hydrothermal Synthesis
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This tensile test is to mimic the worst-case scenario of the swab being caught on an obstruction when being pulled out of the nasopharyngeal space. It is to determine how much tensile force the swab can withstand without breaking. A variety of different swabs (different materials and different geometries) were tested using the protocol outlined in Section 2 (Tensile Testing Procedure). Not all of the swabs were pre-treated using the Autoclave. For those swabs that were pre-treated using the Autoclave, the tensile tests were performed within 6 hours of completion of the Autoclave pre-treatment, unless otherwise noted. The FormLabs-USF and FormLabs-Northwell were printed at LLNL using FormLabs Surgical Grade V1 Resin on a Form 3B Printer. Results Summary: All FormLabs design and treatment variations (e.g. autoclaving and “aging”) had higher tensile strength compared commercial swabs. Autoclaving degraded the tensile strength. “Aging” after autoclaving improved the tensile strength. “Aging” without autoclaving degraded the tensile strength. No differences were observed in tensile strength with different autoclaving protocols. No significant differences were observed in tensile strength for different batches.
Autoclave
Tensile testing
Universal testing machine
Breaking strength
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Abstract The nanocrystals of title are prepared at different pH values by hydrothermal reaction of Na 2 WO 4 and either MnCl 2 , MnCO 3 , or Mn(OH) 2 as Mn source (autoclave, 150 °C, 3 h).
Autoclave
Hydrothermal reaction
Hydrothermal Synthesis
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The state-of-art of compressive strength and tensile strength of recycled concrete is made.Based on experiment results of the cubic compressive strength and splitting tensile strength of 27 recycled concrete specimens,the relationship between splitting tensile strength and cubic compressive strength of recycled concrete is proposed.It is shown that spiltting tensile strength of recycled aggregate concrete is lower 30% than that of natural aggregate concrete when the values of their cubic compressive strength are the same.
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In this paper, we discuss five parameters that indicate the inhomogeneity of a stack of parallel isotropic layers. We show that, in certain situations, they provide further insight into the intrinsic inhomogeneity of a Backus medium, as compared to the Thomsen parameters. Additionally, we show that the Backus average of isotropic layers is isotropic if and only if $\gamma=0$. This is in contrast to parameters $\delta$ and $\epsilon$, whose zero values do not imply isotropy.
Zero (linguistics)
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Abstract The title compound is hydrothermally synthesized from an aqueous mixture of PbBi 2 O 5.9 (obtained by stirring a solution of NaBiO 3 and Pb(NO 3 ) 2 at 10 °C for 5 d), Ba(OH) 2 , and KOH (autoclave, 240 °C, 2 d).
Autoclave
Hydrothermal Synthesis
Hydrothermal reaction
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