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  1. Article ; Online: Nonlinear Modeling of Contact Stress Distribution in Thin Plate Substrates Subjected to Aspect Ratio.

    Lv, Chao / Wei, Huixin / Lan, Zhiwen / Wu, Ping

    Sensors (Basel, Switzerland)

    2023  Volume 23, Issue 8

    Abstract: The foundation substrate's basal contact stresses are typically thought to have a linear distribution, although the actual form is nonlinear. Basal contact stress in thin plates is experimentally measured using a thin film pressure distribution system. ... ...

    Abstract The foundation substrate's basal contact stresses are typically thought to have a linear distribution, although the actual form is nonlinear. Basal contact stress in thin plates is experimentally measured using a thin film pressure distribution system. This study examines the nonlinear distribution law of basal contact stresses in thin plates with various aspect ratios under concentrated loading, and it establishes a model for the distribution of contact stresses in thin plates using an exponential function that accounts for aspect ratio coefficients. The outcomes demonstrate that the thin plate's aspect ratio significantly affects how the substrate contact stress is distributed during concentrated loading. The contact stresses in the thin plate's base exhibit significant nonlinearity when the aspect ratio of the test thin plate is greater than 6~8. The aspect ratio coefficient-added exponential function model can better optimize the strength and stiffness calculations of the base substrate and more accurately describe the actual distribution of contact stresses in the base of the thin plate compared to linear and parabolic functions. The correctness of the exponential function model is confirmed by the film pressure distribution measurement system that directly measures the contact stress at the base of the thin plate, providing a more accurate nonlinear load input for the calculation of the internal force of the base thin plate.
    Language English
    Publishing date 2023-04-17
    Publishing country Switzerland
    Document type Journal Article
    ZDB-ID 2052857-7
    ISSN 1424-8220 ; 1424-8220
    ISSN (online) 1424-8220
    ISSN 1424-8220
    DOI 10.3390/s23084050
    Database MEDical Literature Analysis and Retrieval System OnLINE

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  2. Article: Wetness duration, temperature and cultivar affect floral infection by Botrytis cinerea in alfalfa

    Gossen, Bruce D. / Lan, Zhiwen

    Canadian journal of plant pathology. 2021 Nov. 02, v. 43, no. 6

    2021  

    Abstract: Blossom blight of alfalfa, caused by Botrytis cinerea and Sclerotinia sclerotiorum, can be an important constraint to alfalfa seed production on the Canadian Prairies. Botrytis cinerea is the predominant pathogen in rain-fed production areas across the ... ...

    Abstract Blossom blight of alfalfa, caused by Botrytis cinerea and Sclerotinia sclerotiorum, can be an important constraint to alfalfa seed production on the Canadian Prairies. Botrytis cinerea is the predominant pathogen in rain-fed production areas across the northern Prairie region. This study assessed the optimum conditions for infection of alfalfa florets by B. cinerea, and susceptibility in alfalfa based on cultivar and flower colour/orientation. The disease reaction of the cultivars was assessed in detached and intact inflorescences inoculated under controlled conditions and in field trials. The optimum temperature for infection was 20°C, with a minimum of 12 h of surface wetness. Increased duration of surface wetness generally increased infection, except at 30°C, where continued exposure to high temperature reduced infection. There were small but consistent differences in flower infection among cultivars, which were consistent across the testing protocols (detached inflorescence, whole-plant and field). Upward-facing inflorescences had a lower incidence of infection than downward-facing inflorescences. Also, purple florets were slightly less susceptible relative to white/yellow florets, but in only one of the three cultivars assessed. Knowledge of infection requirements from this study can be used to improve management of blossom blight, but the differences among cultivars were generally too small to have an important impact on disease management in the field.
    Keywords Botrytis cinerea ; Sclerotinia sclerotiorum ; alfalfa ; blight ; cultivars ; disease control ; florets ; flower color ; pathogens ; plant pathology ; rainfed farming ; temperature
    Language English
    Dates of publication 2021-1102
    Size p. 812-819.
    Publishing place Taylor & Francis
    Document type Article
    ZDB-ID 763044-x
    ISSN 0706-0661 ; 1715-2992
    ISSN 0706-0661 ; 1715-2992
    DOI 10.1080/07060661.2021.1922940
    Database NAL-Catalogue (AGRICOLA)

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    In stock of ZB MED Bonn / Germany

    Z 3709: Show issues

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  3. Article: Constitutive Relations of Anisotropic Polycrystals: Self-Consistent Estimates.

    Li, Aimin / Zhao, Tengfei / Lan, Zhiwen / Huang, Mojia

    Materials (Basel, Switzerland)

    2022  Volume 15, Issue 14

    Abstract: In this paper, the elastic constitutive relation of polycrystals contains the effect of the mesostucture coefficients. We consider a general case and derive the average elastic constitutive relation pertaining to polycrystals of cubic crystals with any ... ...

    Abstract In this paper, the elastic constitutive relation of polycrystals contains the effect of the mesostucture coefficients. We consider a general case and derive the average elastic constitutive relation pertaining to polycrystals of cubic crystals with any symmetry of crystalline orientation in their statistical distribution. Following Budiansky and Wu, we used self-consistent estimates of eigenstrain to obtain the effective elastic constitutive relation of polycrystals in an explicit form. For the Voigt assumption and the Reuss assumption, the effective elastic constitutive relation of polycrystals on cubic crystals contains the the mesostructure coefficients up to linear terms. In general, the linear term expression works well for materials such as aluminum, the single crystal of which has weak anisotropy. However the same expression (which allows the anisotropic part of the effective elastic constitutive relation to depend only linearly on the mesostructure coefficients) does not suffice for materials such as copper, in which the single crystal is strongly anisotropic. Per the Taylor theorem, we expand the expression based on the self-consistent estimates with respect to the mesostructure coefficients up to quadratic terms for anisotropic polycrystals of cubic crystals. While our numerical data are very close to those of Morris, our expression is much simpler.
    Language English
    Publishing date 2022-07-17
    Publishing country Switzerland
    Document type Journal Article
    ZDB-ID 2487261-1
    ISSN 1996-1944
    ISSN 1996-1944
    DOI 10.3390/ma15144974
    Database MEDical Literature Analysis and Retrieval System OnLINE

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