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 混合模式键断裂解决方案 Mixed-Mode Bond Fracture Solution

VISCA_bond 软件
粘合剂对现代制造业至关重要，但计算模拟关键结构粘接的可靠性始终是令人头疼的难题。粘接线断裂受模式混合、粘弹性及温度等现象影响而变得复杂。Psylotech推出VISCA_bond——一款易于实施、技术先进的粘合剂粘接模拟解决方案。

Adhesives are crucial to modern manufacturing, yet simulating mission-critical structural bonds remains a significant headache. Bondline fracture is complicated by such phenomena as mode-mix, viscoelasticity, and temperature. Psylotech introduces VISCA_bond, an easy to implement, state-of-the-art, adhesive bond simulation solution.

Mixed Mode Fracture Frame 混合模式断裂加载框架
高保真粘结区建模必须纳入模式混合效应。VISCA_bond系统采用Psylotech微型万能试验机的特殊双驱动器版本，可对双悬臂梁试样施加任意模式混合载荷（详见底部示意图）。每个横梁端部均可测量作用力，并通过数字图像相关法（DIC）测量梁端延伸的散斑标记处的挠度与旋转角度。粘结模拟解决方案包含测试规程与数据分析软件。

High fidelity cohesive zone modeling must incorporate mode mix. For VISCA_bond, a special dual actuator version of Psylotech's miniature universal load frame applies any mode mix to a double cantilever beam specimen. (see reverse) Force is measured at each crosshead. Deflection and rotation are measured with DIC (digital image correlation) from speckle patterned “flags” extending from beam ends. Testing protocols and data analysis software are included in adhesive bond simulation solution.

Direct Traction Separation Law Extraction 直接提取牵引分离定律
混合模式断裂框架（MMFF）能够直接提取模式I和模式II的牵引分离定律。相较于其他凝聚区方法，这一关键优势意味着牵引力与位移之间的关系不受任何预设形状的限制。相反，该方法直接测量特定粘结系统对应的非线性断裂过程区域，并将其应用于有限元分析。

The Mixed Mode Fracture Frame (MMFF) enables direct extraction of Mode I and Mode II traction separation laws. This key advantage over alternative cohesive zone approaches means the relationship between tractions and displacements is not constrained to any presumed shape. Instead, the nonlinear fracture process zone specific to a given bonding system is directly measured and implemented in FEA.

Workflow 工作流
该解决方案可快速融入现有产品设计流程。首先，根据标准协议在MMFF上测试粘合系统。其次，软件后处理器自动从实验数据中提取I型与II型牵引分离定律。最后，Abaqus用户只需将粘结区单元定义为VISCA_bond单元即可。除上述步骤外，Abaqus工作流程保持不变。

The solution quickly plugs into your existing product design process. First, the adhesive bond system is tested per a standard protocol on the MMFF. Second, a software post processor automatically extracts Mode I & II traction separation laws from experimental data. Third, Abaqus users simply define cohesive zone elements as VISCA_bond elements. The Abaqus workflow is otherwise unchanged.

Rate, Creep & Temperature Dependence 速率、蠕变与温度依赖性
假设聚合物粘合剂主导时间依赖性，Psylotech的VISCA™结合VISCA_bond可模拟粘合线粘弹性。VISCA™是Psylotech的聚合物仿真解决方案，包含1/a收缩测试服务及2/Abaqus材料定义附加模块。该软件模块采用热力学驱动的简化时间本构模型，可有效模拟任意应变或温度历史。VISCA™还包含粘弹性体积模量，当粘接层厚度相对于横向尺寸较小时，该参数至关重要。

Assuming the polymer adhesive dominates time dependence, Psylotech's VISCA™ combined with VISCA_bond can model bondline viscoelasticity. VISCA™ is Psylotech's polymer simulation solution consisting of 1/a contract testing service & 2/an Abaqus material definition add-on module. The software module is a thermodynamics driven, reduced time constitutive model, capable of effectively simulating any strain or temperature history. VISCA™ also includes a viscoelastic bulk modulus, which is important when bond thickness is small relative to the transverse dimensions.

VISCA™ workflow

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