1.1 Preparation of boric/phosphomolybdic acid modified-red mud A known amount of raw red mud was first washed with distilled water two to three times and then dried in an oven. When the red mud dried completely; it was treated with a 5 M solution of boric acid/ phosphomolybdic acid for 24 hours. Then it was […]
Category: ADVANCES IN COMPOSITE MATERIALS – ECODESIGN AND ANALYSIS
Thermoplastic Polymer based Modified Red Mud Composites Materials
A. H. Bhat1, H. P.S. Abdul Khalil and A. K. Banthia2 1School of Industrial Technology, Universiti Sains Malaysia, Penang-11800, 2Materials Science Centre, Indian Institute of Technology Kharagpur-721302, 1Malaysia 2India 1. Introduction Soaring prices are a reminder of the essential role that affordable products play in sustainable economic growth and higher human development. Utilization of waste […]
Test verification and leakage rate prediction method
Tests were performed on a fully automatic testing machine for gasket performances, and the specific details on the test machine and test procedure can be found in the reference (Gu et al., 2007b). The test conditions are listed in Table 12. Sample Quantity Sample Dimension (mm) Test Medium Gasket Seating Stress (MPa) Gas Pressure Difference […]
. Sealing behaviour of non-asbestos sealing composites
1.7.3 Leakage model of non-asbestos gasket sealing NASC can be assumed to be a kind of porous media. The flow of gas through porous media includes molecular transfer and convection transfer. The leakage rate L of gases flowing through porous media can be calculated using the capillary model (Gu et al., 2007b). where ri and […]
Performance evaluation of NASC
1.7 Mechanical performances of non-asbestos sealing composites The properties of NASC specified in current standards include mainly density, transverse tensile strength, plasticity, oil resistance, and so on. The performances of non-asbestos sealing gaskets can be divided into two types. One is related to the performance indexes of gasket products, which are the main items of […]
Prediction of creep behavior
The creep behavior equation of NASC can be expressed by Eq. (48). Because the strain in both fiber and interface is much smaller than that in matrix, only the strain in matrix is considered under compressive load. Then the stress-strain relationship of the third part in Fig.6 resulted from the resilience constitutive equation is in […]
Prediction of the transverse tensile strength
The transverse tensile strength is a main evaluating indicator for NASC in engineering, and its prediction may be performed according to 3 cases, as follows. 1. Debonding of interface from fiber In this case, the transverse tensile strength can be calculated by Eq. (35) can be used to predict the transverse tensile strength assuming that […]
Prediction of the longitudinal tensile strength
The temperature-related longitudinal tensile strength a//L of NASC can be calculated by Eq. (33). °TL fd1 fi ffVf °J + fdVm cm where fi = (1- Vt), °T is the mean stress in fibers when tensile failure occurs and it can be obtained from the micromechanical model of NASC, °/ is the mean stress in […]
Prediction of the tensile module
Due to the effect of fibers, the maximum permissible deformation of NASC is only about 10% of that of rubber and the bearing capacity of NASC is greatly improved. The tensile module can be used to characterize the bearing capacity of NASC. The longitudinal tensile module EcL can be calculated by Eq. (27) if the […]
Prediction of mechanical performances of NASC
1.6.1 Prediction of the stress-strain relationship Since the module of interface is much smaller than that of fibers and the interface thickness is much smaller than the matrix, the load is borne mainly by the fibers and the matrix. When the aspect ratio of the fiber is no larger than a critical value, the stress-strain […]