上海仿坤發布MPDB_V1.0
該模型是上海仿坤軟件科技有限公司（LSDYNA-China)基于LSTC (Livermore Software Technology Corporation)公司發布的版本號為LSTC.MPDB.190409_V2.0的MPDB模型基礎上改進而來。
此模型在LSTC.MPDB.190409_V2.0 基礎上主要改進工作是通過在MPDB的BLOCK B上添加30個可以漏氣的氣囊(關鍵字為*AIRBAG_SIMPLE_AIRBAG_MODEL_ID)，以此來考慮壁障在碰撞過程中壁障內部的空氣沒有及時排除，而引起的蜂窩腔內的氣體壓力升高這一物理現象。同時調整了BLOCK B蜂窩處的材料曲線，使其動態性能滿足相應法規要求。
公司網址：www.lsdyna-china.com
聯系郵箱地址：feamodel@lsdyna-china.com
聯系電話：021-61261195 4008533856
1、版本歷史
Fangkun.MPDB. V1.0
基于LSTC (Livermore Software Technology Corporation)公司發布的版本號為LSTC.MPDB.190409_V2.0的MPDB模型基礎上改進而來。為上海仿坤軟件科技有限公司發布的第一個版本
在MPDB的BLOCK B上添加30個可以漏氣的氣囊(關鍵字為*AIRBAG_SIMPLE_AIRBAG_MODEL_ID)，以此來考慮壁障在碰撞過程中壁障內部的空氣沒有及時排除，而引起的蜂窩腔內的氣體壓力升高這一物理現象。
相比LSTC.MPDB.190409_V2.0調整了BLOCK B 蜂窩處的材料曲線
推薦使用R7 或者更高版本
該MPDB模型的力vs 變形響應在Euro_NCAP_MPDB (文件號 TB022, 發布于2017年10月23日)所述的通道內
因此，本MPDB模型與物理測試結果基本一致
其他細節描述詳見LSTC.MPDB.190409_V2.0文檔，本模型其他細節與其所述的細節一致。
文件構成：
發布的模型文件夾內有三個和計算相關的模型文件Main_MPDB_Assembly_10.k、mat_sec_curve.asc、MPDB.Main.Rigid.Tube.k ，其中mat_sec_curve.asc為加密文件，已通過*include被Main_MPDB_Assembly_10.k引用。
MPDB已有地面剛性墻，用戶不需要另建MPDB的地面剛性墻
*CONTROL_TIMESTEP里有選擇質量縮放，請勿關掉（參數IMSCL）
*CONTROL_SHELL中ISTUPD為4
set_part ID 19或1為MPDB與整車接觸的所有part（19為MPDB模型所有PART集合，1為除后面小車的其他所有PART集合），請使用該ID設置與整車的接觸。與整車之間的接觸請使用*CONTACT_AUTOMATIC_SURFACE_TO_SURFACE（注意不要包含任何整車的一維單元，否則速度會很慢）。
MPDB模型的ID號范圍為1-600,000
整車模型請include Main_MPDB_Assembly_10.k .
2、單位
模型單位為mm-ms-kg-kN .
3、模型描述
圖1、BLOCK B 添加30個氣囊
在LSTC公司的LSTC.MPDB.190409_V2.0模型基礎上進行改進：BLOCK B處添加了30個考慮漏氣的氣囊，由殼單元劃分，氣囊所用關鍵字為*AIRBAG_SIMPLE_AIRBAG_MODEL_ID，氣囊通過*CONSTRAINED_NODAL_RIGID_BODY與BLOCK B的前后板進行連接。
整體模型信息：厚殼單元數量: 24526 ，殼單元數量: 502053，節點數量：353077，梁單元數量: 11069 ，時間步長: 6.3e-4 ms。由于模型其他細節均與LSTC.MPDB.190409_V2.0一致，詳見附錄A.
圖2、30個氣囊的整體尺寸
4、結果&驗證
A. Rigid Tubular Impactor
圖3、力vs變形變化圖 [不同DT2MS的值]
由上圖可以看出，本模型采用不同的DT2MS值(每個值填入LS-DYNA中為負值)，其結果都在法規要求的邊界通道內，且基本一致。
5、本MPDB模型整車應用案例
圖4、前面板變形仿真與試驗對比圖
圖5、壁障小車加速度仿真與試驗對比圖
1
附錄 A –壁障LSTC.MPDB.190409_V2.0的介紹摘錄
由于本模型的其他細節與壁障LSTC.MPDB.190409_V2.0完全一致，其他介紹請參考下文：
? (1)BARRIER BLOCK DIMENSIONS AND DESCRIPTION
Oblique View and Dimensions of Mobile Progressive Deformable Barrier
Figure 1 – Barrier Block Oblique View
Side View of Mobile Progressive Deformable Barrier
Figure 2 barrier block side view
Mobile Progressive Deformable Barrier Construction
Figure 3 – PDB Construction
Barrier Block Construction
The Mobile Progressive Deformable Barrier is broadly partitioned into three deformable honeycomb cores.
The front and the rear cores are homogeneous and have constant crush strength, when crushed statically.
The middle core offers a progressive crush resistance through its depth of 450 mm.
The quasi-static test procedure to evaluate the strength of the middle core is discussed in the reference document provided with this package+.
Figure 4 – Barrier Block
+TB-022-euro-ncap-mobile-progressive-deformable-barrier-face-specification-
Figure 5 – Crush strength specification for different cores
Cladding and Plate Construction
The three blocks comprising the Mobile Progressive Deformable Barrier are separated by aluminum plates, as shown in the following figure.
Further, the blocks are bonded to the plates through epoxy resin which is modeled by employing spotweld beams characterized by *MAT_SPOTWELD, with appropriate failure parameters (forces) in axial and shear directions.
The barrier blocks are contained by an outer cladding along three directions and a back plate in one direction.
Figure 6 – Cladding and Plate Construction
? (2)BARRIER AND CART DIMENSIONS
A. Cart for Rigid Tubular Impactor
Figure7 – Rigid Tube Impactor and Cart – Side View
Figure 8 – Rigid Tube Impactor and Cart – Top View
? (3)IMPACTOR CONSTRUCTION
A. Rigid Tube Impactor
B.1.Impactor Shape
Figure 9 – Impactor Shape
B.2.Impactor Features
Impact Velocity = 60 kph [16.667 m/s]
B.3.Impactor Mounted on Cart
Figure 10 – Impactor and Cart Weight
B.4.Impactor Dimensions, Overlap and Test Procedure
The impactor overlaps the barrier by 800 mm along its width, as shown in the following figure:
Figure 11 – Impactor Overlap along width
The impactor overlaps the barrier by 400 mm along the height of the barrier, as shown in the following figure:
Figure 12 – Impactor Overlap along height
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