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Procedia Earth and Planetary Science 2 ( 2011 ) 133 – 138

The article mainly studies the YJ3128-type dump truckÿs sub-frames, for the fatigue crack occurred in the Sub-

frame witch has worked in bad condition for 3 to 5 months, the truckÿs working conditions and the load features are

researched, and ANSYS is used to analyze the stress of the sub-frame. According the deferent stress, the reason of the

fatigue cracksÿ occurring is researched too. At last an improvement and optimization to the structures of the frame is

provided. For the stress of YJ3128-type dump truck there is no improved research methods and theoretical support, so

the analysis in this paper and the proposed improvement scheme has important reference value.

© 2011 Published by Elsevier Ltd. Selection and/or peer-review under responsibility of Society for

Resources, Environment and Engineering

Keywords: dump truck, sub-frame, finite element analysis, fatigue crack

1878–5220 © 2011 Published by Elsevier Ltd.

doi: 10.1016/.2011.09.022

134 Chen Yanhong and Zhu Feng / Procedia Earth and Planetary Science 2 ( 2011 ) 133 – 138

0 Introduction

As the state’s infrastructure investment increased year by year, the demand for heavy-duty trucks are

also multiplying, China's annual demand of heavy-duty trucks is 95 million or more, and its annual

growth rate is 15% or 20%. YJ3128-type dump truck is a Transport vehicles designed and manufactured

by Inner Mongolia First Machinery Group Corporation and China North Mercedes-Benz Co., Ltd. It is

formed by the main-frame, sub-frame, Cab, cargo box, the hydraulic lifting mechanism, engine, and gears.

The sub-frame connected the main frame and the container, and increased strength and stiffness of the

main frame, and lead to the main frame ‘s distributed load force. Therefore, the designing of the sub-

frame has the important influence to the main frame’s quality and service life. YJ3128-type dump truck’s

sub-frame is researched by the Co. itself, but after been used for 3-5 months, there will be cracking at the

right side of the square beams and the turning point of the left stringer.

Figure 1 the fatigue crack of the sub-frame

1 The FEM model of the sub-frame

1.1 The structure of the sub-frame

The YJ3128-type dump truck’s frame is formed by the main-frame and the sub one, and they are all

edge beam type. The vertical beam of the sub-frame is right up the main-frames’, and they are connected

by the U-bolts. The sub-frame of the truck is developed by the Co., and it’s length is 4.7m, forth-width is

0.901m, and the back-width is 0.761m. The 8mm thick V-beam is trough, all its section is the same.

There is a trough auxiliary beam flipping In it. There are six beams in the sub-frame, that are a cylindrical

beam at the back of it, a square beam in the middle, and four trough beams, Which are showed in figure 2.

Figure 2 structure of the sub-frame