Predictive model for the fatigue life of a low-cost leaf cup mold

Name: Somsak Limwongsakorn

Organization : Phuket Rajabhat University. Faculty of Science and Technology

Name: Hanphon Mitwong

Organization : Phuket Rajabhat University. Faculty of Science and Technology

Email : mhanphon@pkru.ac.th

Name: Wasawat Nakkiew

Organization : Chiang Mai University. Faculty of Engineering

keyword: Fatigue life

LCSH: Predictive modeling

; Leaf-based materials

LCSH: Molds (Fungi)

LCSH: Materials -- Mechanical properties

Abstract: Natural, environmental and health conservation have recently been a driving trend in using natural materials for foodware, such as teak and banana leaves, instead of plastic and foams. But cup forming machine is generally expensive primarily because of mold price. This research therefore proposes a design for cup forming machine made of natural leaves, and on that basis, predicts useful lifetime of the associated low-cost molds. The design of the machine that has the capacity to form foodware by using natural leaves with diameter of 200 mm, will have the depth of 450 mm. From the experiment, it is found that the optimal factor conditions for the forming process can be achieved by using heat at 120C for 150 seconds. In this setting, the average cost of each banana-leaf cup is estimated at 0.35 Baht, starch water weighing 10 grams (g), where estimate of cost recovery is 52 days. If applying static finite element analysis (FEA) by using mold made of stainless steels (SUS 304) weighing 360 g, fatigue damage based on thermodynamic calculation (by using software ANSYS in the prediction of fatigue life cycles) shows that it requires forces of 10-kN in order to form cups at 120C. On this premise, there will be residual stress at the maximum level of 284 MPa on each side of the holes at the bottom of the cup, but also residual heat in the process at the maximum temperature of 84.58C. The fatigue life prediction of the mold is estimated at 36 million cycles

King Mongkut's University of Technology North Bangkok. Central Library

Address: BANGKOK

Email: library@kmutnb.ac.th

Created: 2024

Modified: 2025-03-17

Issued: 2025-03-17

บทความ/Article

application/pdf

BibliograpyCitation : In Thai Institute of Chemical Engineering and Applied Chemistry. The 33st Thai Institute of Chemical Engineering and Applied Chemistry International Conference (TIChE 2024) (pp.617-624). Bangkok : Thai Institute of Chemical Engineering And Applied Chemistry

eng

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