Nonlinear Analysis of the Reinforced Three-Layer Composite Panel sStrength

The application of polymer composite material structures is one of the dynamically developing areas of aerospace engineering. In this area, numerical methods are widely used for design research. Nevertheless, there is still an urgent need to develop effective methods for analyzing the complex mechanism of modern composite structure behavior. The absence of such methods can result in significant financial costs of testing model and full-scale structures, which can negatively affect the timing of new equipment creation. The modeling of nonlinear static loading of a honeycomb three-layer panel by the finite element method has been performed. The design scheme has been developed for carrying out the strength calculation. The effect of the phenomenological fracture criterion on the strength of a three-layer panel is analyzed. Comparison of the theoretical and experimental data showed good agreement. This indicates that the developed scheme of the honeycomb three-layer panel strength calculation can be successfully used in practice.

Substantiation of Improvements for the Bearing Structure of an Open Car to Provide a Higher Security during Rail/Sea Transportation

This article presents the most frequent damage in the bearing structure of a rail car during rail/sea transportation. The study includes load modes for the bearing structure of an open car such as unloading with a grab and transportation by a train ferry. It was found that the most vulnerable element of the bearing structure of an open car during unloading with a grab is the top cord. The authors suggest applying a viscous material (an elastomer) to reinforce the top cord. This solution was confirmed by means of a strength calculation, whose results showed the efficiency of the solution. The bearing structure of an open car during the train ferry transportation can be protected by mounting special fixation units on the bolster beams. The geometry of such units was chosen according to that of a chain binder. The results of the strength calculation demonstrated that the strength of the bearing structure of an open car was provided with the application of the fixation units suggested. The article also presents the results of the experimental determination of the strength of the improved bearing structure of an open car based on the finite element method and full-scale bench testing. The research conducted might be used by those who are interested in higher operational efficiency of rail cars during rail/sea transportation.

Investigating the reliability of shear strength equations in TS500 and ACI318-19

Lateral loads (e.g., wind and earthquake loads) lead to shear forces as well as the axial loads and moments on the structural members. Although reinforced concrete (RC) columns are commonly assumed as slender members and are not expected to represent shear dominant response characteristics, experimental studies have shown that even slender columns have shear responses. Hence, in seismic design, the shear strength of columns must be accurately predicted to prevent shear failure of columns. Validation of Requirements for Design and Construction of RC structures (TS500) for shear strength calculation of RC columns by a broad range of test data has been neglected in the literature. In this study, 57 test results of rectangular RC columns were collected from available laboratory tests to verify the shear strength calculation approach in TS500. Additionally, a statistical comparison of results obtained from TS500 with Building Code Requirements for Structural Concrete (ACI318-19) has been studied in this study. Maximum shear strength of RC columns obtained from the previously studied test data was compared with shear strengths calculated according to TS 500 as well as with the results obtained from ACI318-19. Comparisons are scrutinized in terms of shear-span-to-depth ratios, reinforcing ratios, material properties, and stirrup spacing as well as axial load ratios applied on top of the columns. Investigation of existing design equations reveals a significant difference in prediction. This study will be extended by adding further test results from the literature to provide crucial comments about the shear strength calculation of RC columns in TS500.

Research into the Strength of an Open Wagon with Double Sidewalls Filled with Aluminium Foam

The research is concerned with the use of double walls filled with aluminium foam for an open wagon in order to decrease the dynamic stresses during the operational modes. The research presents the strength calculation for the bearing structure of an open wagon with consideration of the engineering solutions proposed. It was found that the maximum equivalent stresses appeared in the bottom section of the centre sill behind the back support; they amounted to about 315 MPa and did not exceed the allowable values. The maximum displacements were detected in the middle section of the centre sill and amounted to 9.6 mm. The maximum deformations were 1.17 × 10−2. The research also presents the strength calculation for a weld joint in the maximum loaded zones of the bearing structure of an open wagon and gives the results of a modal analysis of the bearing structure of the improved open wagon. It was found that the critical oscillation frequencies did not exceed the allowable values. The results of the research may be useful for those who are concerned about designing innovative rolling stock units and improving the operational efficiency of railway transport.

Analysis of the Loading on an Articulated Flat Wagon of Circular Pipes Loaded with Tank Containers

This research is concerned with the use of double walls filled with foam aluminum for an open wagon to decrease loading during operational modes. The research presents the strength calculation for the frame of a wagon with a consideration of the engineering solutions proposed. It was found that the maximum equivalent stresses appeared in the bottom section of the center sill behind the back support; they amounted to about 290 МPа and did not exceed the allowable values. The maximum displacements were in the middle parts of the main longitudinal beams of a section, and they amounted to 8.8 mm. The research also presents the strength calculation for a weld joint in the maximum loaded zones of the frame of a wagon and reports the results of the modal analysis of the frame of the improved wagon. It was found that the oscillation frequencies did not exceed the allowable values. The results of the research may be useful for those who are concerned about designing innovative rolling stock units and improving the operational efficiency of railway transport.

Development of the design and method of calculating the strength of the roll-type electric baromembrane apparatus

The design of the roll-type electric baromembrane apparatus is developed. High quality separation of solutions is achieved by combining electric baromembrane separation with electrode cooling using collectors for the flow of cooling water with an independent arrangement of drainage channels of the near-cathode and near-anode permeate. A method is proposed for calculating the strength of the body of an electric baromembrane apparatus with the determination of the required thickness of the body wall and fiberglass flanges. Keywords: electric baromembrane apparatus, separation, membrane, strength calculation. [email protected]

CALCULATION OF REFERENCE REACTIONS AND AXIAL STROKE OF A SECTION OF A STEEL GAS PIPELINE FOR THE OBJECT “ROOF GAS BOILER HOUSE”

The main stages of the strength calculation of a steel gas pipeline attached to the facade of a building, to determine the values of reference reactions, as well as the axial stroke of bellows compensators for the Roof gas boiler project are considered. The calculation was made on the basis of the finite element method by specialists in the Moscow city Center. Based on the results of the strength calculation, it was concluded that the strength and reliability of the considered section of the gas pipeline is ensured.