彈性力學(xué)仿真軟件：LS-DYNA基本操作與界面熟悉

彈性力學(xué)仿真軟件：LS-DYNA基本操作與界面熟悉1彈性力學(xué)仿真軟件：LS-DYNA1.1軟件介紹與安裝1.1.11LS-DYNA概述LS-DYNA是一款由美國LSTC公司開發(fā)的多物理場仿真軟件，特別擅長于非線性動力學(xué)問題的求解。它最初設(shè)計用于解決沖擊動力學(xué)問題，但隨著版本的不斷更新，其應(yīng)用范圍已擴展至汽車碰撞、爆炸、金屬成型、結(jié)構(gòu)優(yōu)化、流固耦合等多個領(lǐng)域。LS-DYNA的核心優(yōu)勢在于其強大的求解器，能夠處理大規(guī)模的有限元模型，以及其豐富的材料模型和接觸算法，使得仿真結(jié)果更加準(zhǔn)確和可靠。1.1.22軟件安裝步驟安裝LS-DYNA通常需要遵循以下步驟：下載軟件安裝包：從LSTC官方網(wǎng)站或授權(quán)代理商處下載LS-DYNA的安裝包。確保下載的版本與你的系統(tǒng)兼容。解壓安裝包：使用解壓縮軟件如WinRAR或7-Zip解壓下載的安裝包到一個指定的目錄。運行安裝程序：找到解壓后的安裝程序，通常是setup.exe或install.sh（對于Linux系統(tǒng)），雙擊運行。接受許可協(xié)議：閱讀并接受LS-DYNA的軟件許可協(xié)議。選擇安裝類型：根據(jù)需要選擇完整安裝或自定義安裝。完整安裝會安裝所有組件，而自定義安裝允許你選擇特定的模塊進行安裝。指定安裝路徑：選擇軟件的安裝路徑，建議不要安裝在系統(tǒng)盤（如C盤）以提高性能。配置環(huán)境變量：安裝完成后，需要在系統(tǒng)環(huán)境變量中添加LS-DYNA的路徑，以便在命令行中調(diào)用軟件。驗證安裝：通過運行LS-DYNA的一個示例模型，驗證軟件是否正確安裝。1.1.33系統(tǒng)需求與兼容性LS-DYNA的系統(tǒng)需求會根據(jù)版本的不同而有所變化，但以下是一些基本的硬件和軟件要求：操作系統(tǒng)：支持Windows、Linux和Unix等多種操作系統(tǒng)。處理器：多核處理器，支持SSE2指令集或更高版本。內(nèi)存：至少8GB，對于大型模型，建議使用64GB或更多。硬盤空間：至少需要10GB的可用空間，具體取決于安裝的模塊和數(shù)據(jù)。圖形卡：支持OpenGL的圖形卡，用于圖形界面的顯示。確保你的系統(tǒng)滿足這些要求，以獲得最佳的仿真性能和體驗。1.2示例：運行LS-DYNA的簡單模型下面是一個在Linux系統(tǒng)下運行LS-DYNA的簡單示例。假設(shè)你已經(jīng)安裝了LS-DYNA，并且模型文件example.k位于/home/user/LS-DYNA/models目錄下。#設(shè)置環(huán)境變量

exportLD_LIBRARY_PATH=/home/user/LS-DYNA/lib:$LD_LIBRARY_PATH

exportPATH=/home/user/LS-DYNA/bin:$PATH

#運行LS-DYNA

lsdynamppncpu=4input=/home/user/LS-DYNA/models/example.k在這段代碼中，我們首先設(shè)置了環(huán)境變量LD_LIBRARY_PATH和PATH，以確保系統(tǒng)能夠找到LS-DYNA的庫文件和可執(zhí)行文件。然后，我們使用lsdyna命令運行模型，其中mpp表示使用并行處理，ncpu=4指定了使用4個處理器核心，input參數(shù)指定了模型文件的路徑。1.3結(jié)論通過上述介紹和示例，你已經(jīng)對LS-DYNA的安裝和基本運行有了初步的了解。接下來，你可以開始探索LS-DYNA的更多功能，如材料模型的設(shè)置、接觸算法的調(diào)整等，以滿足更復(fù)雜仿真需求。2彈性力學(xué)仿真軟件：LS-DYNA基本操作與界面熟悉2.1界面熟悉與基本設(shè)置2.1.11主界面布局解析LS-DYNA的主界面設(shè)計直觀且功能豐富，主要由以下幾個部分組成：標(biāo)題欄：顯示軟件名稱和當(dāng)前打開的文件信息。菜單欄：提供文件、編輯、視圖、插入、格式、工具、幫助等菜單選項，每個菜單下有多個子選項，用于執(zhí)行不同的操作。工具欄：位于菜單欄下方，包含常用功能的快捷按鈕，如新建、打開、保存、運行仿真等。模型視圖區(qū)：占據(jù)界面中心，用于顯示和編輯模型。支持多種視圖模式，如正視圖、側(cè)視圖、俯視圖和透視圖。狀態(tài)欄：位于界面底部，顯示當(dāng)前操作狀態(tài)、坐標(biāo)信息和選擇的元素信息?？刂泼姘澹和ǔＮ挥诮缑嬗覀?cè)，提供模型屬性、材料屬性、邊界條件、載荷等的設(shè)置。消息窗口：顯示軟件操作的反饋信息和錯誤提示，幫助用戶了解仿真過程中的狀態(tài)。2.1.22菜單欄與工具欄功能2.1.2.1菜單欄功能文件：管理項目文件，包括新建、打開、保存、導(dǎo)入和導(dǎo)出等。編輯：提供模型編輯功能，如復(fù)制、粘貼、刪除、查找和替換等。視圖：控制模型視圖，包括縮放、旋轉(zhuǎn)、平移和視圖模式切換等。插入：添加模型元素，如節(jié)點、單元、材料和載荷等。格式：設(shè)置模型的顯示格式，如顏色、透明度和線型等。工具：提供高級工具，如網(wǎng)格檢查、模型優(yōu)化和后處理等。幫助：提供軟件使用指南和在線幫助文檔。2.1.2.2工具欄功能新建：創(chuàng)建一個新的仿真項目。打開：打開一個已存在的項目文件。保存：保存當(dāng)前項目。運行仿真：執(zhí)行仿真計算。后處理：查看和分析仿真結(jié)果。網(wǎng)格生成：快速生成模型網(wǎng)格。材料屬性：設(shè)置材料的物理和力學(xué)屬性。邊界條件：定義模型的邊界條件。載荷：施加各種載荷，如力、壓力和溫度等。2.1.33首選項設(shè)置與自定義LS-DYNA允許用戶自定義界面和操作習(xí)慣，以提高工作效率。首選項設(shè)置通常包括：界面設(shè)置：調(diào)整界面顏色、字體大小和布局等。網(wǎng)格設(shè)置：設(shè)置網(wǎng)格的生成規(guī)則和顯示樣式。材料設(shè)置：定義默認(rèn)材料屬性和單位系統(tǒng)。仿真設(shè)置：配置仿真參數(shù)，如時間步長、求解器類型和輸出頻率等?？旖萱I設(shè)置：自定義快捷鍵，以快速執(zhí)行常用操作。2.1.3.1示例：自定義快捷鍵假設(shè)您希望將“運行仿真”操作的快捷鍵設(shè)置為Ctrl+R，可以按照以下步驟操作：打開LS-DYNA，進入“首選項”設(shè)置。尋找“快捷鍵”或“鍵盤映射”選項。在列表中找到“運行仿真”操作。雙擊或選擇該操作，然后在“快捷鍵”輸入框中輸入Ctrl+R。點擊“應(yīng)用”或“確定”保存設(shè)置。2.1.3.2示例：設(shè)置材料屬性在LS-DYNA中設(shè)置材料屬性，如彈性模量和泊松比，可以通過以下步驟進行：在控制面板中選擇“材料”選項。選擇或創(chuàng)建一個材料類型。在材料屬性編輯器中輸入彈性模量（例如：200e9）和泊松比（例如：0.3）。點擊“應(yīng)用”或“確定”保存材料屬性設(shè)置。#假設(shè)使用PythonAPI設(shè)置材料屬性

importlsdyna_api

#創(chuàng)建LS-DYNAAPI實例

lsdyna=lsdyna_api.LSDyna()

#設(shè)置材料屬性

material_id=1

lsdyna.set_material_properties(material_id,elasticity_modulus=200e9,poisson_ratio=0.3)

#應(yīng)用設(shè)置

lsdyna.apply_material_settings()以上代碼示例展示了如何使用PythonAPI來設(shè)置LS-DYNA中的材料屬性，包括彈性模量和泊松比。通過調(diào)用set_material_properties方法并傳入相應(yīng)的參數(shù)，可以輕松地修改材料屬性。最后，調(diào)用apply_material_settings方法來應(yīng)用這些設(shè)置。2.1.3.3示例：定義邊界條件定義邊界條件是LS-DYNA仿真中關(guān)鍵的一步，以下是一個簡單的示例，展示如何使用PythonAPI來定義一個固定邊界條件：#使用PythonAPI定義固定邊界條件

importlsdyna_api

#創(chuàng)建LS-DYNAAPI實例

lsdyna=lsdyna_api.LSDyna()

#定義固定邊界條件

boundary_id=1

node_ids=[101,102,103]#假設(shè)固定這些節(jié)點

lsdyna.set_boundary_condition(boundary_id,node_ids,fixed=True)

#應(yīng)用邊界條件設(shè)置

lsdyna.apply_boundary_conditions()在這個示例中，我們首先創(chuàng)建了一個LS-DYNAAPI實例。然后，定義了一個邊界條件，指定了一組節(jié)點ID，并設(shè)置這些節(jié)點為固定狀態(tài)。最后，通過調(diào)用apply_boundary_conditions方法來應(yīng)用邊界條件設(shè)置。通過熟悉LS-DYNA的界面布局、菜單和工具欄功能，以及掌握如何自定義首選項，用戶可以更高效地進行彈性力學(xué)仿真工作。這些操作和設(shè)置是LS-DYNA軟件使用的基礎(chǔ)，掌握它們將有助于用戶更好地控制和優(yōu)化仿真過程。3模型創(chuàng)建與編輯3.11導(dǎo)入CAD模型在LS-DYNA中，導(dǎo)入CAD模型是開始仿真分析的第一步。這通常涉及到從各種CAD軟件（如SolidWorks,CATIA,NX等）導(dǎo)出的模型文件。LS-DNA支持多種文件格式，包括IGES,STEP,STL等。以下是如何在LS-DYNA中導(dǎo)入一個STEP格式的CAD模型：#使用preprocessor模塊導(dǎo)入STEP文件

*include,file=part.step在上述代碼中，*include命令用于導(dǎo)入外部文件，file參數(shù)指定了要導(dǎo)入的文件名。確保文件路徑正確，否則LS-DYNA將無法找到并導(dǎo)入模型。3.1.1示例假設(shè)我們有一個名為part.step的文件，該文件包含一個簡單的立方體模型。在LS-DYNA的輸入文件中，我們可以這樣導(dǎo)入：*keyword

*include,file=part.step

*end導(dǎo)入后，模型將出現(xiàn)在LS-DYNA的預(yù)處理環(huán)境中，可以進行進一步的網(wǎng)格劃分、材料屬性和邊界條件設(shè)置。3.22網(wǎng)格劃分技巧網(wǎng)格劃分是將連續(xù)體模型離散化為有限元模型的過程。在LS-DYNA中，網(wǎng)格的質(zhì)量直接影響到仿真的準(zhǔn)確性和計算效率。以下是一些網(wǎng)格劃分的技巧：使用合適的網(wǎng)格尺寸：網(wǎng)格尺寸應(yīng)根據(jù)模型的尺寸和預(yù)期的應(yīng)力變化來確定。在應(yīng)力變化較大的區(qū)域，應(yīng)使用更細(xì)的網(wǎng)格。避免過度扭曲的單元：過度扭曲的單元可能導(dǎo)致仿真結(jié)果不準(zhǔn)確。使用*element_shell或*element_solid命令時，檢查單元質(zhì)量。使用映射網(wǎng)格：對于規(guī)則形狀，映射網(wǎng)格可以提供更高質(zhì)量的網(wǎng)格。例如，對于一個立方體，可以使用映射網(wǎng)格來確保所有單元都是正六面體。3.2.1示例假設(shè)我們正在對一個立方體進行網(wǎng)格劃分，我們可以使用以下命令：*keyword

*element_solid

1,1000,1,2,3,4,5,6,7,8

*end在上述代碼中，*element_solid命令用于定義一個實體單元。數(shù)字1和1000分別表示單元ID和材料ID，而1,2,3,4,5,6,7,8是構(gòu)成該單元的節(jié)點ID列表。3.33材料屬性與邊界條件設(shè)置材料屬性和邊界條件是LS-DYNA仿真中不可或缺的部分。材料屬性定義了模型的物理特性，而邊界條件則控制了模型的外部環(huán)境。3.3.1材料屬性設(shè)置LS-DYNA支持多種材料模型，包括彈性、塑性、復(fù)合材料等。使用*material_elastic命令可以定義彈性材料的屬性。*keyword

*material_elastic

1,0.3,2.1e11

*end在上述代碼中，1是材料ID，0.3是泊松比，2.1e11是楊氏模量。3.3.2邊界條件設(shè)置邊界條件可以是固定約束、載荷、接觸條件等。使用*boundary_spc命令可以定義固定約束。*keyword

*boundary_spc

1,1,0.,0.,0.

*end在上述代碼中，1是節(jié)點ID，1表示約束所有三個方向的位移，0.,0.,0.是約束的位移值。3.3.3示例假設(shè)我們有一個立方體模型，材料為彈性材料，泊松比為0.3，楊氏模量為2.1e11Pa。我們想要固定模型的一個面。以下是如何在LS-DYNA中設(shè)置這些屬性：*keyword

*material_elastic

1,0.3,2.1e11

*element_solid

1,1000,1,2,3,4,5,6,7,8

*boundary_spc

1,1,0.,0.,0.

*end在上述代碼中，我們首先定義了材料屬性，然后劃分了網(wǎng)格，最后設(shè)置了邊界條件。這是一個基本的LS-DYNA輸入文件結(jié)構(gòu)，用于設(shè)置模型的材料屬性、網(wǎng)格和邊界條件。4作業(yè)設(shè)置與提交4.11定義載荷與約束在LS-DYNA中，定義載荷與約束是模擬真實物理環(huán)境的關(guān)鍵步驟。載荷可以是力、壓力、溫度變化等，而約束則限制了模型的自由度，如固定邊界條件。4.1.1定義載荷4.1.1.1力載荷LS-DYNA使用關(guān)鍵字*CLOAD來定義力載荷。例如，對節(jié)點100施加一個沿x軸的力，大小為1000N：*CLOAD

100,1,1000.這里，100是節(jié)點編號，1表示沿x軸方向，1000.是力的大小。4.1.1.2壓力載荷使用*PRESSURE關(guān)鍵字定義壓力載荷。例如，對單元1000施加一個壓力，大小為500Pa：*PRESSURE

1000,500.4.1.2定義約束4.1.2.1固定約束使用*BOUNDARY關(guān)鍵字來定義固定約束。例如，固定節(jié)點100的所有自由度：*BOUNDARY

100,1,0.

100,2,0.

100,3,0.這里，1、2、3分別表示x、y、z軸方向的自由度。4.22作業(yè)參數(shù)設(shè)置作業(yè)參數(shù)設(shè)置包括選擇求解器類型、設(shè)定時間步長、定義輸出控制等。4.2.1選擇求解器類型LS-DYNA支持多種求解器，如顯式求解器、隱式求解器等。在輸入文件中，通過*CONTROL_EXPLICIT或*CONTROL_IMPLICIT來選擇。4.2.1.1顯式求解器*CONTROL_EXPLICIT4.2.1.2隱式求解器*CONTROL_IMPLICIT4.2.2設(shè)定時間步長時間步長的設(shè)定對仿真結(jié)果的準(zhǔn)確性至關(guān)重要。使用*DT關(guān)鍵字來定義時間步長。例如，設(shè)定時間步長為0.001s：*DT

0.0014.2.3定義輸出控制使用*OUTPUT關(guān)鍵字來控制輸出結(jié)果的類型和頻率。例如，每0.01s輸出一次結(jié)果：*OUTPUT

0.014.33提交作業(yè)與運行檢查4.3.1提交作業(yè)在LS-DYNA中，作業(yè)提交通常通過命令行或圖形界面完成。確保輸入文件（.k文件）正確無誤后，使用以下命令提交作業(yè)：ls-dynainput_file.k這里，input_file.k是你的輸入文件名。4.3.2運行檢查提交作業(yè)后，LS-DYNA會生成輸出文件，通常為.d3plot格式。使用LS-DYNA的后處理工具，如DYNA3D或D3Plot，來檢查和分析仿真結(jié)果。4.3.2.1使用DYNA3D檢查結(jié)果dyna3dinput_file.d3plot4.3.2.2使用D3Plot檢查結(jié)果d3plotinput_file.d3plot以上步驟和示例詳細(xì)介紹了在LS-DYNA中如何定義載荷與約束、設(shè)置作業(yè)參數(shù)以及提交作業(yè)和運行檢查的基本操作。5結(jié)果后處理與分析5.11結(jié)果文件解讀在LS-DYNA仿真完成后，軟件會生成一系列的結(jié)果文件，包括但不限于.d3plot、.d3thck、.d3vec等。這些文件包含了仿真過程中的各種數(shù)據(jù)，如位移、應(yīng)力、應(yīng)變等，是進行后處理分析的基礎(chǔ)。5.1.1.d3plot文件.d3plot文件是LS-DYNA的主要結(jié)果文件，包含了所有時間步的節(jié)點和單元數(shù)據(jù)。例如，下面是一個.d3plot文件的結(jié)構(gòu)示例：```plaintextDYNA3DPART1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,6高級功能與技巧6.11接觸算法與碰撞檢測在LS-DYNA中，接觸算法是處理不同物體間相互作用的關(guān)鍵。這些算法允許模擬中物體的精確碰撞檢測和響應(yīng)，對于動態(tài)仿真尤其重要。LS-DYNA提供了多種接觸算法，包括：自動接觸（AUTOMATICSINGLESURFACECONTACT）:用于處理同一物體內(nèi)部不同部分之間的接觸。自動接觸（AUTOMATICDOUBLESURFACECONTACT）:用于處理兩個不同物體之間的接觸。剛體接觸（RIGIDBODYCONTACT）:用于處理剛體與變形體之間的接觸。6.1.1示例：自動接觸在LS-DYNA中，定義自動接觸可以通過關(guān)鍵字*CONTACT_AUTOMATIC_SINGLE_SURFACE來實現(xiàn)。下面是一個簡單的示例，展示如何在LS-DYNA輸入文件中定義自動接觸：```lsdyna*CONTACT_AUTOMATIC_SINGLE_SURFACE0.0,1.0,0.0,0.0,0.0,0.0,0.0,0.0,0.0,0.0,0.0,0.0,0.0,0.0,0.0,0.0,0.0,0.0,0.0,0.0,0.0,0.0,0.0,0.0,0.0,0.0,0.0,0.0,0.0,0.0,0.0,0.0,0.0,0.0,0.0,0.0,0.0,0.0,0.0,0.0,0.0,0.0,0.0,0.0,0.0,0.0,0.0,0.0,0.0,0.0,0.0,0.0,0.0,0.0,0.0,0.0,0.0,0.0,0.0,0.0,0.0,0.0,0.0,0.0,0.0,0.0,0.0,0.0,0.0,0.0,0.0,0.0,0.0,0.0,0.0,0.0,0.0,0.0,0.0,0.0,0.0,0.0,0.0,0.0,0.0,0.0,0.0,0.0,0.0,0.0,0.0,0.0,0.0,0.0,0.0,0.0,0.0,0.0,0.0,0.0,0.0,0.0,0.0,0.0,0.0,0.0,0.0,0.0,0.0,0.0,0.0,0.0,0.0,0.0,0.0,0.0,0.0,0.0,0.0,0.0,0.0,0.0,0.0,0.0,0.0,0.0,0.0,0.0,0.0,0.0,0.0,0.0,0.0,0.0,0.0,0.0,0.0,0.0,0.0,0.0,0.0,0.0,0.0,0.0,0.0,0.0,0.0,0.0,0.0,0.0,0.0,0.0,0.0,0.0,0.0,0.0,0.0,0.0,0.0,0.0,0.0,0.0,0.0,0.0,0.0,0.0,0.0,0.0,0.0,0.0,0.0,0.0,0.0,0.0,0.0,0.0,0.0,0.0,0.0,0.0,0.0,0.0,0.0,0.0,0.0,0.0,0.0,0.0,0.0,0.0,0.0,0.0,0.0,0.0,0.0,0.0,0.0,0.0,0.0,0.0,0.0,0.0,0.0,0.0,0.0,0.0,0.0,0.0,0.0,0.0,0.0,0.0,0.0,0.0,0.0,0.0,0.0,0.0,0.0,0.0,0.0,0.0,0.0,0.0,0.0,0.0,0.0,0.0,0.0,0.0,0.0,0.0,0.0,0.0,0.0,0.0,0.0,0.0,0.0,0.0,0.0,0.0,0.0,0.0,0.0,0.0,0.0,0.0,0.0,0.0,0.0,0.0,0.0,0.0,0.0,0.0,0.0,0.0,0.0,0.0,0.0,0.0,0.0,0.0,0.0,0.0,0.0,0.0,0.0,0.0,0.0,0.0,0.0,0.0,0.0,0.0,0.0,0.0,0.0,0.0,0.0,0.0,0.0,0.0,0.0,0.0,0.0,0.0,0.0,0.0,0.0,0.0,0.0,0.0,0.0,0.0,0.0,0.0,0.0,0.0,0.0,0.0,0.0,0.0,0.0,0.0,0.0,0.0,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