PSI - Issue 60

A. Bhardwaj et al. / Procedia Structural Integrity 60 (2024) 723–734 Abhimanyu Bhardwaj/ Structural Integrity Procedia 00 (2019) 000 – 000

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3. Finite Element Analysis 3.1. Structural analysis

Thermal stresses arise in components at elevated temperatures due to internal and external mechanical constraints. In the present case, the entire job-carrier is fabricated from TZM alloy, which eliminates internal constraints; however, external constraints may result from the applied loading. A comprehensive structural analysis is performed for two cases: (1) Only structural load is applied of 400 kg (distributed load) at the top of the job carrier. (2) Both structural load of 400 kg (distributed load) at the top of the job-carrier and temperature ramping of the complete assembly to 1200 deg C (refer Fig. 5). SOLID187 elements are used for the discretization of the job carrier. It is a higher-order 3-D, 10-node element characterized by quadratic displacement behaviour, making it suitable for modelling irregular meshes, such as those generated from various CAD/CAM systems. The element nodes possess three degrees of freedom, enabling translations in the nodal x, y, and z directions. Moreover, the element incorporates capabilities for plasticity, hyper elasticity, creep, stress stiffening, large deflection, and large strain analysis. It also allows for mixed formulation to simulate deformations of nearly incompressible elastoplastic materials, as well as fully incompressible hyperplastic materials. Temperatures are assigned as element body loads at the all nodes. Various simulation parameters and loading conditions are illustrated in Table 3 and Fig. 5, respectively.

Table 3 Simulation parameters for structure analysis. Parameter

Value

Analysis type

Static-Structural

Element Software Case 1 Case 2

SOLID187

ANSYS-Work bench

400 kg (distributed load) at the top of the job-carrier

Both structural load of 400 kg (distributed load) at the top of the job-carrier and temperature ramping of the complete assembly to 1200 deg C.

Fig. 5 Loading of the job-carrier in case 1 and 2.

3.2. Case 1 The computed maximum Von Mises stress is 49 MPa, and the stress intensity is 56 MPa. These values are found to be well below the allowable stress limit of 267 MPa. The distribution of Von-Mises stresses and stress intensity within the job-carrier is illustrated in Fig. 6 and 7, respectively. Notably, the plate stiffeners demonstrate the highest Von Mises stress and stress intensity.