PSI - Issue 36

A. Babii et al. / Procedia Structural Integrity 36 (2022) 203–210 A. Babii, T. Dovbush, N. Khomuk et al. / Structural Integrity Procedia 00 (2021) 000 – 000

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Fig. 1. Main view of solid organic fertilizer distributor (a) and a place of cracks formation (b) taking place at maximal loading and moving on rough ground. Weight distribution of solid organic fertilizer on the distributor body space is mostly of variable form both in

cross- section and longitudinal planes. Let’s consider and classify the determining factors of unbalanced loading on the distributor body space (Fig. 2). We assume that organic fertilizer are distributed on the body symmetrically relating to the central axis of the trailer unit under the distributed customary operation mode conditions. This kind of distribution does not cause any considerable torsion strains in longerons and traverse of the structural system. Under unpredictable operation conditions, namely nonsymmetric distribution of the fertilizer relating to the central axis, action of impact loads while travelling with some obstacles and others, some asymmetric external loads are taking place causing the appearance of considerable torque moments in the elements of the bearing structural system. The distributor frame is made from eight closed Design features of the distributor frame: three longitudinal longerons of Z-like section which are connected with one another by five cross-sectional traverses of a hollow pipelike section of rectangular cross section. Longerons and marginal traverses which are in close contact with the distributor body accept the external loading of the organic fertilizers and mechanisms weight mounted on them and designed for fertilizers distribution. There are two cross members which are directly connected with the longerons and designed for running gear suspension, the front one is additionally loaded by the pulling force. The principal scheme of distributor main support frame with division into separate elements including the cross-sections shape is shown on Figure 3. According to the scheme aimed at building a design model of a distributor frame the main support frame is divided into following joints and elements: І is lateral longitudinal longeron of Z-like cross- section, divided into sections 3, 5, 7, 9. The size of these sections at building a load

Fig. 2. Scheme of supporting metalwork loading distribution of fertilizer distributor: q (s) is distributed load, I, II is lateral longerons of Z-like cross- section, III is central longeron whose cross-section is made of two Z-like sections, IV is travers (cross members) of pipelike cross-sections.

sections located symmetrically referred to the frame axis and welded with each other by welded seams. Some parts of the frame are made of open cross sections. Under fertilizers and chemical crop protection products application conditions the distributor frame is influenced by corrosive environments. Taking into account the transportation and maintenance conditions of fertilizer distributors the frames design is subjected to the considerable dynamic loading which varies according to a certain cycle. In this case there is a possibility of resonance and some fatigue fractures (cracks) formation.

Fig. 3. Scheme of supporting system and fertilizer distributor sections.