自重和风荷载对小麦茎秆倒伏力学特性的影响

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中图分类号：S512.1 文献标识码：A 文章编号：2095-5553（2025）12-0337-08

Abstract：The lodgingof wheat stems hasasignificantly negative effecton wheat yield.Research on theanti-lodging abilityofwheatisof greatsignificanceforthepredictionof wheatlodgingand breedingofhigh-yieldandlodgingresistant wheat varieties.To investigatethe lodging resistanceof wheat stemsunder self-weightand windloads，this study establishedavariablecross-sectionmodelincludingtheselfweightofstemusingJinnong19Oasthesubject.Thecritical forceof the stem wascalculatedbyusingthe matrix transfer method，andthestress variation lawof the stemunder wind loadwasanalyzed byusing the2R pseudo-rigid-bodymodelmethod.Theaccuracyofthe modelcalculationswasvalidated by using ANSYS.Theresultsshow thatthe massof wheat stem significantly afects the critical forceofthe stem，as wel asthe maximumstress between thefirstand secondbasal intermodes.Whenconsidering stemmass，thecritical forceof the stem is decreased by approximately 29% ，and the maximum stress in the first and second basal internodes is increased by 39%-45% .For Jinnong 19o，the maximum stress of the stem occurs in the first basal internode.Due to the different geometriccharacteristicsof thecros-sectionsofeach internode，themaximum stressof theinternodestrenddecreases initially and then increases from the base to the top of the stem.

Keywords：wheat stem；fall down；mechanical model；self-weight；wind load；critical force

0 引言

2023年我国小麦产量占全国粮食产量的19. 64% ，小麦单产为 5781kg/hm2[1，2] 。（剩余11387字）